Harken 7413.10 User Manual

MKIV JIB REEFING & FURLING

Unit 3, 4

Installation Manual – Intended for specialized personnel or expert users

Preassembly

Safety precautions/parts descriptions 2
Sizing check 3
Parts 4 - 5
Line/rigging parts check/tools 6
Dimensions/sailmaker's instructions 7
Toggle deductions/stay into foil options 8
Top foil length Unit 3/Unit 4 9 -10
Short top foil Unit 3/Unit 4 11 - 12
Confirm foil length 13

Assembly

Foils/connectors 14 - 20
Halyard swivel 20
Drum assembly 21
Rod rigging 22
Attach turnbuckle/toggle 23

Attach toggle/short length plate 24
Attach toggle/long length plate 25
Feeder/final 26

Commissioning–Unit 3/4

Turnbuckle on boat 27
Lead line to cockpit 28
Halyard wrap/prevent halyard wrap 29
Pendant/halyard: restrainer/ halyard tension 30

Commissioning—Unit 4

Tying soft attachment tack/head/halyard 31

Operation

Halyards/headstay tension 32
Raise sails/storm sails/reefing 33
Reef/secure sail 34
Race conversion 35

Maintenance

Clean/inspect 36
Replace line 36
Storage/remove furler 36

Troubleshoot 37
Warranty 37
Appendix 38 - 41

4673 11/14

Please read these instructions carefully before installing, servicing, or operating the equipment.

This manual may be modified without notice. See: www.harken.com/manuals for updated versions.

PLEASE SAVE THESE INSTRUCTIONS

Safety Precautions/Parts Description

Introduction

This manual gives technical information on installation and service. The information is destined exclusively for
specialized personnel or expert users. Installation, disassembling, and reassembling by personnel who are not
experts may cause serious damage to property, injury to users, and injury to those in the vicinity of the product.
If you do not understand an instruction, contact Harken.

The user must have appropriate training in order to use this product.

Harken accepts no responsibility for damage or harm caused by not observing the safety requirements and
instructions in this manual. See Limited Warranty, General Warnings and Instructions at www.harken.com/manuals.

Purpose

Harken Jib Reefing and Furling systems are designed for rolling sails on sailboats to reduce sail size or to completely
roll so wind has little effect on the sail. Use of this product for other than normal sailboat applications is not covered
by the limited warranty.

Safety Precautions

WARNING! This symbol alerts you to potential hazards that may kill or hurt you and others
if you don't follow instructions. The message will tell you how to reduce the
chance of injury.

CAUTION! This symbol alerts you to potential hazards that may hurt you and others if
you do not follow instructions. The message will tell you how to reduce the
chance of injury.

WARNING! Strictly follow all instructions to avoid potential hazards that
may kill or hurt you and others. See www.harken.com/manuals
for General Warnings and Instructions.

6

5

2

4

3

1

5

7

8

Unit 4 soft attachment

Parts Descriptions

1) Jaw/jaw toggle

2) Link plates

3) Hub extension

4) Shackles

MKIV units 3, 4 2

5) Drum assembly

6) Foil clamp

7) 610 mm (2') bottom foil

8) Feeder

9) Connector bushing

10) Bottom connector

11) 2.13 m (7') foil

12) Connector screws

13) Connector wedge

14) Connector

15) Halyard swivel

16) Trim cap

17) Trim cap screws

Preassembly Sizing Check

17

16

15

13

15

12

11

14

Unit 4 soft attachment

10

9

Online product registration

www.harken.com/furlingwarranty

Size Check

1. Check headstay and clevis pin dimensions in chart below.

WARNING! Do not drill boat's chainplate or toggle. This may result in rig failure.
Use the correct size toggle and clevis pin.

2. Harken does not recommend drilling boat’s chainplate or toggle. Bushings may be required
to fit boats with smaller clevis pin sizes.

3. Will drum fit on bow? See page 7. If necessary, use an additional toggle to slightly raise unit.
To clear anchor use a Harken long link plate which can be cut to various lengths.

UniPart no. Description Wire Ø

7

/16", 1/2" 11 mm, 12 mm

7413.10 MKIV Unit 3

-22, -30

Toggle part no. Description Chainplate clevis Ø

UNIT 3

UNIT 4

MKIV units 3, 4 3

7413.20 3/4 Jaw/jaw toggle w/short link plate

7413.20 7/8 Jaw/jaw toggle w/short link plate

7313.21 3/4 Long link plate w/jaw/jaw toggle

7313.21 7/8 Long link plate w/jaw/jaw toggle

Part no. Description Wire Ø

1

7414.10 MKIV Unit 4

-30, -40, -48

Toggle part no. Description Chainplate clevis pin Ø

7

7414.20

/

8

Jaw/jaw toggle w/short link plate

7414.20 1 Jaw/jaw toggle w/short link plate 1"

7414.20 11/

8

Jaw/jaw toggle w/short link plate

3

/4" 19.1 mm

7

/8" 22.2 mm

3

/4" 19.1 mm

7

/8" 22.2 mm

/2", 9/16", 5/8" 12 mm, 14 mm, 16 mm

7

/8" 22.2 mm

11/8" 28.57 mm

Rod Ø

9.53 mm, 11.1 mm

Chainplate Clevis Pin

Rod Ø

11.1 mm, 12.7 mm, 14.3 mm

25.4 mm

Preassembly Parts

610 mm (2')

bottom foil

2.13 m (10 - 7') foils
Unit 3, 4

Halyard swivel

unit 3

Drum assembly

unit 3

Blue Loctite

®

adhesive

Main components

Description Unit Part No. Qty

Drum assembly with clamp

610 mm (2') bottom foil

2.13 m (7') foil

Halyard swivel

Blue Loctite

Drum Assembly

610 mm (2') bottom foil

2.13 m (7') foil

Halyard swivel

Blue Loctite

4 MKIV units 3, 4

®

adhesive

®

adhesive

3

4

HFG944

7413.33

7413.30

H-39392

833

HFG945

7414.33

7414.30

H-45788

833

1

1

10

1

1

1

1

10

1

1

Halyard swivel

unit 4

Drum assembly

unit 4

Loctite is a registered trademark of Henkel AG & Company KGaA.

Preassembly Parts

Connector bushings

Trim cap

Plastic

Foil screws

connector

wedges

Trim cap screws

Feeder

Bottom

Connectors

connector

Other Components

Description Unit Part No. Qty Size

Connector

Bottom connector

Connector bushing set

Plastic connector wedge set

Foil screw set

Trim cap set

Trim cap screw set

Prefeeder

Feeder with screw and tab

10 mm bow shackle

Red Loctite

Injector, 1 oz. 5200 adhesive

Connector

Bottom connector

Connector bushing set

Plastic connector wedge set

Foil screw set

Trim cap set

Trim cap screw set

Prefeeder

Feeder with screw and tab

Red Loctite

Injector, 1 oz. 5200 adhesive

02/03/11 MKIV units 3, 4 5

®

adhesive (for screws)

®

adhesive (for screws)

3

4

7413.31F

7413.32F

HFG297

(20 EA H-42073/H-42074)

HFG324

(22 EA H-39487)

HFG349

( 46 EA HFS1106)

HFG682
HFG672

( 3 EA HFS1127)

947

H-39756

2124

HFG739

HFG725

7414.31F

7414.32F
HFG946

(H-45542/H-45543)

HFG947

( 24 EA H-45509)

HFG948

( 48 EA HFS1176)

HFG949

(H-45550/H-45551)

HFG672

(3 EA HFS1127)

947

H-45482

HFG739

HFG725

9 248 mm (9.75")

1 356 mm (14")

1 —

1

1

1 —

1

1 —

1 —

3 10 mm

2 —

1

9

1

1

1

1

1 —

1

1

1

2

1 1 oz

—

—

—

1 oz.

272 mm (10.7")

386 mm (15.2")

—

—

—

—

—

—

Bow shackles

unit 3 only

Prefeeder

5200

Red Loctite

®

Injector

adhesive

adhesive

Unit 3

3,4, 6, 10 mm

Unit 4

5, 6 mm

Loctite is a registered trademark of Henkel AG & Company KGaA.

Tools

Description Unit Qty

3, 4, 6, 10 mm hex keys 3 1 each

5, 6 mm hex keys 4 1 each

Preassembly Line/Rigging Parts Check/Tools

Line Diameter/Length

Furling line is not included with furling unit. Purchase 12 mm (7/16") low - stretch
Dacron double - braid line. Line length should be equal to the length of the
boat, plus the length of the foot of the largest genoa, plus 2 m (6').

Line not included.

Toggles

1. Harken toggle assembly required. Sold separately.

2. Mating turnbuckle components, with eye at lower
end, must be purchased separately. See page 8.

3. Headstay might require cutting and shortening to fit
Harken toggle. Some headstays may remain uncut
by replacing lower stud of turnbuckle with stud/eye,
eliminating extra toggle.

4. Rod rigging requires Harken rod adapter stud.

WARNING! A stay that is old or damaged can
break suddenly, causing an accident. Headstay
condition should be checked by a professional
rigger before reusing.

Tools You Will Need

All Units.

Harken toggle

(sold separately).

Jaw/jaw toggle w/

short link plate

Unit Part No.

7413.20 3/4

3

7413.20 7/8

7414.20 7/8

4

7414.20 1

7414.20 1 1/8

Long link

plate w/toggle

Unit Part No.

7313.21 3/4

3

7313.21 7/8

Adhesive Alert

Rod Rigging.

Harken rod adapter

stud required

(sold separately).

Rod adapter stud

Unit Part No.

7426 -22

3

7427 -30
7427 -30

4

7428 -40
7429 -48

3

10

4

12

13

11

1

2

8

6

7

1. Long tape measure 6. Side cutters 11. Center punch

2. Short tape measure 7. Rat-tail file 12. Rigging or black tape

3. Power drill 8. Hex keys (provided) 13. Scissors

4. Drill bit – 4 mm (5/32") 9. Slotted/Phillips screwdrivers 14. Metal straight edge

5. Hacksaw 10. Needle-nose pliers 15. Hammer

6 MKIV units 3, 4

9

5

14

Dacron is a registered trademark of E. I. du Pont de nemours and company or its affiliates.

15

MKIV furlers are shipped with 3M 5200
adhesive. Use adhesives on dry connectors
and foils. Use the special injection system
described in the assembly section. Parts
may immediately be exposed to rain. Cure
is best at 70 F (22 C) with 50% humidity.
Do not apply at temperatures below 40 F
(5 C) and above 100 F (38 C).

Although adhesive has not cured, it will
remain in place on foil joints whether
they are left on the ground or raised up
on boat. Foils can be raised immediately
after assembly and sails are fitted.

Note: A small amount of adhesive may
bulge out of injection ports. If possible let
system sit for several days before sailing.
If adhesive gets on sails, remove using
acetone. For faster-curing adhesive, pur­chase 4200 Fast Cure.

Note: Damaged foils can be repaired.
Use a hand-held propane torch to heat
joints until foils can be pulled apart.

Preassembly Dimensions/Sailmaker's Instructions

Luff Length

Note offsets above and below sail.

A shorter luff may be required if a halyard restrainer is necessary (page 31)
or a toggle or long toggle assembly is used to raise the drum.

If luff of sail is not long enough to put halyard swivel near top of headstay foil,

B

A

a pendant must be added. See page 29.

Tack Setback

Note setback for tack shackle and cut sail accordingly.

Luff Tape Size -6 (5 mm or 6/32")

J - Finished luff tape size: 5.5 mm (0.215")
K - Luff rope size: 4.8 mm (6/32", 3/16")
L - Max Ø in sail groove: 6.5 mm (0.26")
M - Gap in sail groove: 2.4 mm (0.096")

J

K

L

Luff Tape Length

M

Cut off top of luff tape so it is 450 to 600 mm (18" to 24") below head
of sail. This allows head to lag behind rest of sail to help flatten it.
It will also help the head to roll more smoothly.

C

Note feeder height and extend bottom of luff tape downward so it is below feeder.
This will prevent luff tape from catching in feeder as sail is lowered.

Tack and Head Shackles (Unit 3 Only)

Make sure tack and head shackles fit sail
rings. Minimum inside dimensions of

A

standard head and tack shackles are:
(A) 48 mm (17/8")
(B) 21 mm (13/16")

B

Sun Cover

Sun covers may be installed on either side of sail. Be sure to match other

F

sails in the customer's inventory.

Unit 3 only - long link plate

D

E

Note: If a long link plate is used, add the following dimensions to feeder, shackle and drum
height (based on whether plate is used full-length or shortened to one of five hole positions).
Do not add to halyard swivel or top terminal dimensions.

19.1 mm (

22.2 mm (

3

/4") Clevis Pin Add 497 mm to 271 mm (19 9/16" to 10 11/16")

7

/8") Clevis Pin Add 505 mm to 279 mm (19 7/8" to 11")

G

H

I

Unit A B C D E

3*

4

*See note above regarding long link plates.

MKIV units 3, 4 7

5

7

/16" 115/8" 33/8" 93/4" 43/4" 507/8" 505/16" 1811/16" 181/16" 1613/16" 161/2" 711/16" 71/8"

186 mm 296 mm 86 mm 247 mm 121 mm 1293 mm 1278 mm 474 mm 460 mm 427 mm 413 mm 195 mm 180 mm

15

8

/16"

227 mm 280 mm 130 mm 1365 mm 1394 mm 515 mm 486 mm 225 mm 196 mm

— —

111/16" 51/8" 533/4" 547/8"

Unit 4 only

A

F G H I

Max Min Max Min Max Min Max Min

H

— —

201/4" 191/8" 87/8" 73/4"

Preassembly Toggle Deductions/Stay Into Foil Options

Use dimensions of Harken toggle below to build stay to correct length.

rds

Tip: Turnbuckles should be 1/2 to 2/3

open to allow shortening for new wire stretch and for fine-tuning mast rake.

Unit Clevis pin Ø Pin-to-pin length

19.1 mm (

3

22.2 mm (

19.1 mm (

25.4 mm (1") 115 mm (4

4

28.57 mm (1

3

/4") 83 mm (3 9/32")

7

/8") 98 mm (3 7/8")

7

/8") 98 mm (3 7/8")

9

1

/8") 127 mm (5")

/16")

Unit Clevis pin Ø Pin-to-pin length

19.1 mm (

3

22.2 mm (

3

/4") 83 mm (3 9/32")

7

/8") 98 mm (3

7

/8")

Options for Feeding Stay into Foils

1. Swage stud at end of wire.

®

2. Open end of wire and install Norseman or STA-LOK

3. Rod adapter nosepiece for Harken rod adapter stud: Threaded nosepiece must
have a positive lock as well as adhesive. Use Harken stud with cotter pins.
See page 22.

WARNING! Using a threaded nosepiece with only adhesive at the
upper rod eye terminal may result in headstay system failure.
Make sure there is a mechanical lock.

stud after foil is assembled.

STA-LOK is a registered trademark of Barfield Engineering Company Ltd.

8 MKIV units 3, 4

Preassembly Unit 3—Top Foil Length

UNIT 3

Measure A and add to this chart
and length chart below

Inches mm

A

B 1* 25*

E 24 610

F 22.25 565

G

Total A+B+E+F+G

*Add 29 mm (1.12") if using a halyard
deflector.

Make sure upper
measurement points
of A and pin-to-pin
are the same.

Alternate

measurement

point

A

TOP FOIL LENGTH WORKSHEET

1 Pin-to-pin length

2 Subtract ABEFG –

3 Result (pin-to-pin – ABEFG)

4 Subtract D –

To find “D”, pick number from chart below that is closest
to, but not greater than total from step 3.

Inches mm

7 x 84 = 588
8 x 84 = 672

9 x 84 = 756
10 x 84 = 840
11 x 84 = 924

Example–If result from Step 3 is:

800 inches “D” = 756 inches; 20,000 mm “D” = 19202 mm

5

Result (C) top foil length

7 x 2133.6 = 14935.2
8 x 2133.6 = 17068.8
9 x 2133.6 = 19202.4

10 x 2133.6 = 21336
11 x 2133.6 = 23470

Pin

to

pin

A

B

C

D

Length Check

After completing worksheet above fill in A, C, D, and G below. Add
“A” through “G” to confirm total equals your pin-to-pin measurement.

Length chart

Dimensions Inches mm

A Center of pin to bottom of terminal

B Bottom of terminal to top of foil

C Top foil length

D Number of foils ________ x 2133.6 mm (84")

E Bottom foil 24" 610

F Bottom of foil to hub extension holes 22.25" 565

G Hub extension holes to clevis pin

Pin-to-pin length

*Add 29 mm (1.12") if using a halyard deflector.

G: Toggle distance from lower clevis pin to hub extension holes

Toggle part no. Type Clevis pin G distance

7413.20 3/4 Jaw/jaw with short link plate

7313.20 7/8 Jaw/jaw with short link plate

7313.21 3/4 Long link plate w/toggle

7313.21 7/8 Long link plate w/toggle

3

/4" 19.1 mm 5.42" 138 mm

7

/8" 22.2 mm 6.00" 152 mm

3

/4" 19.1 mm 22.00" 559 mm

7

/8" 22.2 mm 22.63" 575 mm

Note: If long link plate is shortened, dimension must be changed or foil will be
too short. Measure distance from hub extension holes down to where clevis pin
attaches toggle to boat. Use this dimension in G above.

MKIV unit 3 9

1"*

25*

Pin

to

E

in

F

G

Preassembly Unit 4—Top Foil Length

UNIT 4

Measure A and add to this chart
and length chart below

Inches mm

A

B 1" 25

E 24" 610

F 25.98" 660

G

Total A+B+E+F+G

Make sure upper
measurement points
of A and pin-to-pin
measurments

Alternate

measurement

point

A

are the same.

TOP FOIL LENGTH WORKSHEET

1

2

3

4

To find “D” pick number from chart below that is closest
to, but not greater than total from step 3.

800 inches “D” = 756 inches 20,000 mm “D” = 19202 mm

5

Pin-to-pin length

Subtract ABEFG

Result (pin-to-pin – ABEFG)

Subtract D

Inches mm

7 x 84 = 588
8 x 84 = 672
9 x 84 = 756

10 x 84 = 840
11 x 84 = 924
12 x 84 = 1008

Example–If result from step 3 is:

Result (C) top foil length

7 x 2133.6 = 14935.2
8 x 2133.6 = 17068.8
9 x 2133.6 = 19202.4
10 x 2133.6 = 021336.0

11 x 2133.6 = 023470.0
12 x 2133.6 = 025603.0

–

–

Pin

to

pin

A

B

C

D

Length Check

After completing worksheet above fill in A, C, D, and G below. Add
“A” through “G” to confirm total equals your pin-to-pin measurement.

Length Chart

Dimensions Inches mm

A Center of pin to bottom of terminal

B Bottom of terminal to top of foil 1" 25

C Top foil length

D Number of foils ________ x 84" (2133.6 mm)

E Bottom foil 24" 610

F Bottom of foil to hub extension holes 25.98" 660

G Hub extension holes to clevis pin

Toggle part no. Type Clevis pin G distance

7414.20 7/8 Jaw/jaw with short link plate

7414.20 1 Jaw/jaw with short link plate 1" 25.4 mm 6.64 169 mm

7414.20 1 1/8 Jaw/jaw with short link plate 1

Pin-to-pin length

G Toggle Distance from Lower Clevis Pin to Hub Extension Holes

7

/8" 22.2 mm 5.95 151 mm

1

/8" 28.57 mm 7.01 180 mm

Pin

E

to

pin

F

G

10 MKIV unit 4

Preassembly Unit 3—Short Top Foil

UNIT 3

If top foil is shorter than 248 mm (9 3/4"), use one of the following techniques to ensure sufficient bearing
surface for the foil in the area of the halyard swivel.

")

4

/

3

248 mm (9

248 mm (9 3/4") No special treatment required.

")

8

/

1

"–7

8

/

5

Cut-offs

244 – 181 mm (9

Do not use

244 – 181 mm (9 5/8" – 7 1/8") Do not use plastic bushing above

top connector.

")

2

/

1

")

2

/

1

76 mm (3")

89 mm (3

")

")

2

2

/

/

1

1

51 mm (2")

64 mm (2

38 mm (1

Cut-offs

Do not use

89 S – 38 mm (3 1/2" – 1 1/2") Shorten top foil and adjoining full

length foil so two (2) screws are used to assemble joint instead
of four (4). Do not use plastic bushings above top connector.

Top foil

length from

worksheet

1

3

/2"

(89 mm)

3"

(76 mm)

1

2

/2"

(64 mm)

2"

(51 mm)

1

1

/2"

(38 mm)

1. Initial
top foil

cut length

6 9/16"

(167 mm)

6

(154 mm)

6 9/16"

(167 mm)

5

(129 mm)

4 9/16"

(116 mm)

1

1

/16"

/16"

2. Cut through
middle hole in

top foil.*

Resulting top

foil length Length

5"

(127 mm)

41/2"

(114 mm)

4"

(102 mm)

31/2"

(89 mm)

3"

(76 mm)

3. Shorten
full -

length

adjoining

foil by

cutting

through

middle

hole.*

4. Shorten
connector

4 7/8"

(124 mm)

4 7/8"

(124 mm)

4 7/8"

(124 mm)

4 3/8"

(111 mm)

3 3/4"

(95 mm)

5. Shorten
trim cap

No

No

No

Yes

Yes

178 – 140 mm (7" – 5

Cut-offs

Do not use

Cut-off

Do not use

178 – 140 mm (7" – 5 1/2") Do not use plastic bushing above top

connector. Shorten top of connector and, if necessary, shorten
trim cap.

" – 4")

8

/

3

Cut-offs – Do not use

137 – 102 mm (5

137 – 102 mm (5 3/8" – 4") Do not use plastic bushing above top
connector. Cut connector at cross formed by glue dispersion

*To allow for saw cut, position blade so upper half of middle hole is
preserved.

/2")

1

Under 38 mm (1

Under 38 mm (1 1/2") Eliminate top foil and run foil higher in
drum assembly.

channels. Use single foil screw in top foil only.

MKIV unit 3 11

Preassembly Unit 4—Short Top Foil

UNIT 4

If top foil is shorter than 260 mm (10 1/4"), use one of the following special techniques to ensure sufficient bearing
surface for the foil in the area of the halyard swivel.

/4")

1

260 mm (10

260 mm (10 1/4") No special treatment required.

/16")

9

102 – 38 mm (4" – 11/2") Shorten top foil and adjoining full length
foil so two screws are used to assemble joint instead of four. Do not
use plastic bushings above top connector.

/2")

1

102 mm (4")

89 mm (3

/2")

1

76 mm (3")

51 mm (2")

64 mm (2

/2")

1

38 mm (1

Cut-offs –

Do not use.

Cut-Offs –

258 – 192 mm (10 1/8" – 7

Do Not Use.

258 – 192 mm (10 1/8" – 7 9/16") Do not use plastic bushing above

top connector.

/8")

5

/2" - 6

1

Cut-Offs –

190 – 168 mm (7

190 – 168 mm (71/2" – 6 5/8") Do not use plastic bushing above
top connector. Shorten top of connector and if necessary shorten
trim cap.

Do Not Use.

Top Foil

Length

from

Worksheet

4"

(102 mm)

1

3

/2"

(89 mm)

3"

(76 mm)

1

2

/2"

(64 mm)

2"

(51 mm)

1

1

/2"

(51 mm)

1. Initial
top foil
cut length

3

9

/32"

(231 mm)

8 19/32"

(218 mm)

3

8

/32"

(205 mm)

7 19/32"

(193 mm)

3

7

/32"

(180 mm)

6 9/16"

(167 mm)

2. Cut through
middle hole in
top foil.*

Resulting Top
Foil Length Length

6 17/32"

(166 mm)

6 1/32"

(153 mm)

5 17/32"

(140 mm)

5 1/32"

(128 mm)

4 17/32"

(115 mm)

4 1/32"

(103 mm)

3. Shorten
full length
adjoining
foil by
cutting
through
middle
hole.*

4. Shorten
connector

5 11/32"

(136 mm)

5 11/32"

(136 mm)

5 11/32"

(136 mm)

5 11/32"

(136 mm)

5 5/32"

(131 mm)

4 1/2"

(114 mm)

Do Not Use

5. Shorten

trim cap

No

No

No

No

No

Yes

Cut-Off

/8")

3

/2"–4

1

Cut-Offs – Do Not Use.

165–111 mm (16

165 – 111 mm (6 1/2" – 4 3/8") Do not use plastic bushing above
top connector. Cut connector right at cross formed by glue
dispersion channels. Use single foil screw in top foil only.

12 MKIV Unit 4

*To allow for saw cut, position blade so upper half of middle hole
is preserved.

/2")

1

Under 38 mm (1

Under 38 mm (1 1/2") Eliminate top foil and run foil higher in
drum assembly.

Preassembly Confirm Foil Length

Confirm foil length by laying foils alongside stay
with turnbuckle components.

Pull stay out so it is straight. Attach Harken toggle
to bottom of stay. Make sure toggle straps are
straight. Adjust turnbuckle so that length of stay
with Harken toggle will fit boat. Turnbuckle should
be one-half to two-thirds open to allow for rig
adjustment.

Line up drum assembly so holes below drum line
up with holes in Harken toggle. Make sure toggle
is tensioned when measuring.

Line up bottom foil so foil clamp is centered or just
below center of notches in bottom foil.

Note: Position top foil so that including top cap,
the foil will ride 25 mm (1") below terminal. If wire
fitting at top of stay is swage, foil must ride just
below shoulder of swage. Mark cut line on foil.
Wrap tape around foil as a guide so cut is straight.

Unit 3 only.

If 7304 halyard deflector is

used, add 25 mm (1").

Unit 4

MKIV units 3, 4 13

Assembly Top Foil

Cut foil to length using hacksaw.

Deburr inside edge using rat-tail file.

Prepare top foil for drilling.

Tip: Mark top foil to distinguish
from cut-off piece.

Scribe line on top of foil to mark drill holes.
Lay top foil alongside cut-off piece and use
a flat metal object (i.e. metal ruler) to scribe
top line of foil.

14 MKIV units 3, 4