Crescent TR-672, TR-673 Schematic

Page 1
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CRESCENT
MODELS
TR-672,
TR-673
=
The
tween toward
standard frequency
phonograph,
the
supply only.
the
Creseent
the two
the
rear
Models
width recording
response
These
recording
Models
above
specifications.
TR
TR-672
672
-
Models
models
of
this manual.
or
in
addition
recorders
time is
5"
7"
TR-6?2 Before
TR-6?2
is
the
amplifiers
and
TR,-673
tape,
quality.
to those
have
two
as follows:
Reel
Size
(600
ft.
(1200
ft.
and
TR-673 are
connecting
GENERAL
and
TR-673
used.
are designed
which doubLes
Recordings
made
direcily
tape
speeds,
3 3/4,,Speed
)
)
designed
your
to
line
Manufacfured
I NFORMATION
are meehanically
Notice
to
record
the
be made
from
3/4" and
recorAing
the
I
2
can
hour hours
to operate
supply, be
by:
alike.
the
di-tference
playback
and
ana
from
microphone.
a radiol
per
? L/2,,
7
I/2,,Speed
L/2
I
hour
on
absolutely
hour
60
-
TR
The major
in
the
two
playing
tJlevision
second.
cycles,
certain
673
schematic
tracks
time
with
Using both
ll0-i20
that it
difference
located
of
material
no loss
receiver,
tracks,
volts,
agrees
be-
AC
with
on
or
o
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HOWARD
rw.
sAms
Crescent
fhis
molerial
& co.,
Copydgrtt
ll[TE
5
Industries,
5900
W. Touhy
Chicago 31, Illinois
compiled
ond
lNc.,
.
1957
-
57
All
Righb Rcrcwed
Inc.
published
l
by
INDIANAPOIIS,
INDIANA
stT 350
TOTDER
6
Page 2
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t0-
*6!*
E
Fast
Forward
5"
reel,
7"
reel,
Fast
Rewind
5"
reel,
7"
reel,
Frequency
3/4"
7
L/2"
Power
Output-
2
watts undistored watts mucimum
3
Inputs-
Microphone, Radio-Phono, .5
SPEC
Speed-
45
seconds
90
seconds
Speed-
45
seconds
90
secouds
Response
speed,
speed,
IFICATIONS
65
to 6000
65
to 8500
I
Meg
Impedance
Meg
cycle
cycle
Impedance
per
per
second.
seeond.
FIGURE
I
OPERATI
Control-
Speed
Changing speeds
button in
speed
for
3 3/4"
second.
CAUTION:
per
Do not operate in
Off control
Threading
(5)
and
sure
The Tape-
l.
Place a reel of tape on
an empty reel
reel
the
2.
slots
Unwind about 12" of
asectionof thetape
the tape
side
three
in
Insert the
3. radial
the tape
slots
faces the rear
the reel several turns
secured
reels.
To Record
to the reel
From
NG INSTRUCTIONS
the
"ffptt
second
is
on the
engage the
straight
slot
of the recorder.
free
in the
and all
Microphone-
is
accomplished
or
"Down"
and
"Down"
this control unless
in
the
'rOn"
the right
left
reel
pins
on
from
tape
both hands
with
making
end of the tape into one of the
hub
zure
the empty
of
clockwise,
is
slack
placing
by
position.
lor
7
L/2,'
position.
reel
plate (6)
the reel
the reel. Hold
and
the dull coated
reel. T\rrn
until the
up
taken
between
"flp"
the
plate
making
plates.
insert
tape
the
pet
On-
is
Bias
PAGE
Erase
&
50KC
2
Frequency-.
1.
til
the hrbes to
T\rrn the
a click
is
heard
warm
On-Off-Tone
and
allow
up.
Control
about thirty
clockwise
seconds
un-
for
Page 3
2. Insert the microphone
jack.
far
as
holding
3. Depress
it
will
it
down.
the
go,
plug
into
the
play-record
control knob
turn clockwise until it locks
"Mike"
(2)
while
FIGURE 2
as
tortion. Ttrrn
treble. Set
cording as
phone".
other
as
which
the recording
described
This typeof recording maynot
sounds
as
result
the
radio
tone control to
level
under
"To
be
picked
may
wiII be recorded
maximum
proceed
and
Record From Micro-
be
up by the microphone
satisfactory
on the tape.
with
re-
3
o
I
m
F
Uln 4F
?tru
ol\fl \m
tez
t-l
-l
F
I
O.
\
(.)
4.
your
mouth
"Volume"
flashes
NOTE:
the microphone
Hold
and
control until the
on the loudest
Model
"magic located
Knob.
only
during recording) marks
sound production,
should
rrvrr
on the
extremely
never
completelyclose
To Record From
Recordings from
three
ways:
I.
of to
Placethe
the radio
speaker. T\rrn the radio
a normal level.
speak
in
about
a normal voice.
six
inches
from
Adjtrst
record level indicator
sounds.
TR6?3 recording level indicator is
indicator
eye"
directly in
A
shaped area
'?V'r
being recorded.
the tape recorder
be
set,
indicator
passages
loud
Radio-
microphone
Setting
hrbe.
front of
The
the Play-Record
the
on
the volume of
For undistored
while recording,
tube
or
radio may
about 6" to 12"
it
too high
volume
almost closes
only.
The
fold
over
made
be
volume
wiil cause
indicator is
(visible
eye
re-
control
that the
so
should
"V"
(Overlap).
one
by
in front
control
dis-
the
for
Have a
2.
conductor
clips
across
and Set
a
above.
cribed
the
insert
radio volume
the
Set
under
the
on
3. Have a
plug
plug
the radio
into
the
phone
across
level and
under
"To
radio
of the
this
To
up
set
Record
l. Ifthe
plug
Phono"
the recording as
Microphone",
on
the
jack.
shielded cable
phone plug
other
on one end
end.
Connect
voice eoil terminals
plug
the
cord
into
and
the recording level
"To
Record
shielded
From Microphone".
on one end and the
volume
"Radio-Phono"
proceed
with the
Record From Microphone".
volume and
may
and
tone
be
set anywhere.
From Phonograph-
phonograph
pickup
Settherecording
described under
being
leads, insert
made up
on the radio
the
"Radio-Phono"
tone
controls
and
cable
with a
other
control.
jack.
recording
controls
used has
level
with a
two alligator
and
the alligator clips
as
proceed
two conductor
end
Insert the
the recording
Set
as described
The
has
no effect
phono
it
into the
proceed
and
Record
"To
two
speaker
jack.
described
as des-
connected
phone
position
on
type
"Radio-
with
From
PAGE 3
Page 4
FIGURE 3
Record From
To
1.
Use
Record From Radio"
"To
cording
phone".
as
Teleyision
the
one of
described
2. If thephonographhas is more
which
pin
the
the
plug
"Radio-Phono"
MPORTANT: The
Dual Track Recording'
The Crescent
the tape width
in
ing
two track
is
aceomplished
l.
of the tape
aII
play-record
2.
full
the
(5)
recording.
reel
and the empty
3.
common,
into the adaptor
jack.
reeorder will
microphone or
is
inserted
is recorded at
recording. This
in the
After a
Removethereels
reel
wound
control
over
and
(2i
reel
Properlythreadthetape
Receiver'
methods
three
and
under
"To
a standard
an adaptor
and
in the
is designed
a
fol,lowing
of tape
on to the
placing
has been
idle.
to
from the
it on the
on the left
described
proceed
Reeord
plug
playback
"Radio-Phono"
so
with
From
pin
is
needed.
adaptor
the
record
not
while
only one-half
that
timel thereby
track operation
two
manner:
recorded,
take-up
reel,
recorder,
right
plate
reel
proceed
and
the
Micro-
type
result-
turn
furning
reel
(6).
with
under
re-
plug
Insert
into
from
plug
a
jack.
i.
the
plate
the
4. After
track
winding,
2 above.
Fast
by
cover.
onthedesired
trol
by
Forward
High-speed
pressing
Movement of
isheldin
recording
of
in locating
seconds.
CAUTION:
this track
has
is ready to
reversing the
Fast Rewind-
And
forward
or
the desired
reel
this
a desired
Do not attempt
Rewind" with on anything but
these
high
at a
position.
portion
the
to the unit or
recorded the
been
played
be
reels
described
as
reverse can be
(I0)-tqward
tcnob
controls
speed
These are
as
wilI
long
used
of a recording
Forward" or
"Fast
play-record
position,
idle
breaking
of the tape
wind
first
withotlt
in
obtained
head
the
the tape
con-
the
as
primarily
in
a
"Fast
control
as damage
re-
Step
few
(2)
may
result.
Braking-
I,
The
Crescent
automatic necessity
e.
the release
automatically
To
the Tape".
brake mechanism
for
2.
To
recorder
the forward
A
1.
Thread
Recording-
Slay
hand braking.
"Stop"
fastforward
on
come
tape
Tape Recorder
(I2),
tape
at anytime
or fast
rewind
or
a
to
stop.
described
as
whicheliminates
control.
when
-
rewind
The
under
contains
operating
-
"Threading
an
the
merely
tape will
PAGE 4
Page 5
2.
depressing
3.
desired listening level.
To
Use
Plug external
into
"Output
CAUTION:
play-record
T\rrn
until
Adjustthe
An
_Ext.
Jack.
Do not output
the
it locks.
"Volume"
Speaker-
speaker
"
connect
jack
plug;
transformer
E-{it
To
NOTE:
AnLSplice
Since
Tap_e-
it is impossible to edit
track without affecting
which are
one track only.
to be edited
(2)
and
clockwise
"Tone"
conductor
speaker
control
thru athree conductor
three
without
as damaged to the
and tone control
and splice
other, recordings
the
should
without
controls
plug
plug
into
attached
output
may
tube
result.
be limited
F
IGURE 4
for
one
Erasing
is
on the
without
Recorded Material-
the record
In
automatically
tape.
putting
recording
its
at
set
To Use
Phono"
As A
I.
jack,
Insert
2, Leave the
position.
3.
Speak
"Volume"
4.
Do not have
speaker
or
erased
ff
anything
procedure,
extreme
Public
the microphone
into
and
"Tone"
feedback
position
before
it is
desired
on the tape follow
but
counterclockwise
Address
any
Leave
System-
recording
a new
to erase
the
play-record
the microphone
controls
microphone
howl
for
will result.
on
recording
recording
a
the
"Volume"
position.
plug
iuto
the
control
(2)
and adjust the
desired level"
too close to the
tape
the
put
is
normal control
"Radio-
in
idle
3
o
g
trt
F
la6
1v
PU
on
\rn
tez
'{
{
F
I
o\
\
(.)
I.
portions,
Announcements
etc.
for
Thetape
or by
Unused sections
re-use"
2. Forbestresults,
join
ends together
and trim off
any
maybe
joining
selections
may be
with splicing
excessive
edttedby
cutting out
into
another selluence.
inserted between
of
tape
can
be
cuttapeat a slight
on the
tape
width.
selections,
spliced
glossy
unwanted
together
diagonal,
side
Removing Unit
Fronl
Allservicework except
pressure
sure
the
roller
pad
assembly requires removal of the
carrying case.
ADJUSTMENTS
Casre-
and
adjustment of
cleaning
the head and
of the
head
and
pres-
unit from
PAGE
5
Page 6
I
PAGE
FIGURE
EXPLODTD VIEW
5A.
PHOTOFACT
A
Howrrd
@
"EXPLODED"
Srmr & Co., lnc.
W.
OF
VIEW
1957
PARTS
ABOVE
BASEPLATE.
6
Page 7
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A PHOTOFACT
ED
V I EW
@
Howa'd
"EXPLODED" VIEW
&
\(/. S"mt
lnc.
Co.,
OF PA RTS
1957
BELOW
BA
SEPLATE.
PAGE
7
Page 8
l.
thefour
carefully
Spindle
up
pulley
til the
LiJter
on the the
depr
Loosen
control
tact
Make
and tighten
PIay
fectly
high
head
head
changed.
sealed ments
a
board(17)
is
place
taiuable
tape.
the tape
board.
quency
3000 cycle
unit
output voice
holder
holder
do
at thevoice
of
moved
signal
some back
to
for
has
corder
rewind
the
what
overlap.
holder
apart.
Phillips
(15
The
and
down
(47
correct
Arrn_(22)
This
play-record
record
ess
and
set
knob
strip
sure lifter
-Record-Erase
is
It
with
frequencies
is
to
and
in
to
l.
Oneis
l. 79 gauge
pushed
and
set the
Move
is
2.
The
response.
that
meter
eoil.
(13)
on
this,
and
the
highest
up tape
high
on
the
give
best
After
track
no recording
that but
other
was
should
To remove
Iift
unit
and
spindle
unit
head
straight
35) End
should
screws from
movement.
and 70)
amount
adjusts
move
aud
Adjustment-
the distance
switch
position.
turn
screw
with
its
very
the tape.
play
the
in
(2)
to the left
the
eontacts
arm
set screw.
Head
important
(22)
If it is
or track
be replaced,
bracket
(14)
The bracket is
place
at the factory.
be made
which
theheadheight.
(between
underwherethe
down flush
gauge
the
the head
hitting
second adjustment
Il/64"
with
removed.
head height
slowly up
edge
of
To
signal
the
to
on
head is
or
Play
back
the motorboard
notice
coil.
a
to
AC
voltmeter
the
3000
and forth,
the
Tightenthe
output.
or
down
cannot
notes
recorder
high
setting the height
overlap.
the head
take
track.
recorded
ff this is
while rocking
be made,
on it
on
to
note
respouse.
To do this
on it.
has
the reels
There
is
heard
the
be
bent up to move
from
carrying
up
and out.
Play
Adjustments-
have from
Loosen
pulley
the
play
of end
that
will move
If an
adjustment is
-record
the lifter
that
control
a:cm
or
right
on the left
is
down
Adjustment-
the head
not, low output,
overlap
the
complete
that it
are as follows:
mounts
adjusted
There
Thisis
and
head
946") on the motor-
is
mounted.
gauge
this
If
while the
until
the tape
set
good
be
variation
Make
another
be
Make
should
case,
guides
is for
this
make
unit.
aligned
across
cycle
tape,
screw
bracket
in
headholder
sure
record
recorder,
adjusted
and output
take
recording
a
been
adjusted
of{,
reverse
be no
backwards
ttre
case, remoye
bottom
the
is
as
may
L/gZ',
set
up
obtained.
the
contact
when
(2)
(22)
to
center
end
far
be lined
result.
assembly
of
screw
or down un-
clockwise.
and
as
in
to the
are two
by
set
and tighten
gauge
a
unit is
the
top edge
on
the motor
output
a recording
place
this
on.
Connect
the
rock
(26)
holdiag
will
allow
the output
inthe
the head
it.
If
a
8000
a record
and rock
check
a reel
of tape that
on the re-
on.
them
sound heard.
there is
guide
on the head
the
track further
case and
to l/L6,,
in
the
strip
going
into
necessary
rotate
the con-
of
switch.
go
it
will
per
up
loss
If the
of the
should be
head
and
adjust-
placing
head
The
is
in
not ob-
putling
and fre-
of
on the
an
speaker
the head
the
ybu
voltage
position
was not
cycle
with
play
this
the
head
recorder
Do not
play
and
track
If tube
Vl or
V2 is
the
setting
c-hecked.
the
unit
Speaker".
scale
of.
"Volume"
play-record
AC meter
(R3), of
the
exceed
in
the
Wonrt Take
1.
-
4.
5.
6. Pulley
Fast
Forward
l.
-
Fast
Rewind
l.
a
Speed
2. Belt
3. BeIt
4.
5.
Variation
l.
(56)
andpressureroller
not
carbon tetrachloride.
they
appear
If
2. Flat
of
the
To do
as
described
Connect
across
and
the
'rTone"
control
on
which is
chassis,
the
Iocated
to its
.l volt.
ampli-fier.
Up Tape
Spindle
(a)
Lubricate.
2. Improper (a)
Replace
3. BeIt
(69)
(a)
Clean
(69)
Belt (a)
Remove
Set
screw
(a)
Tighten
in
spindle.
(a)
See above
Spindle
(a)
(a)
(a)
Set
(a)
in
Pulley
(a)
(70)
Replace
Won't Function
Wonrt
(Ib
Lubricate.
(60)
Clean
(60)
Remove
screw
Tighten
spindle.
(4?)
Replace
Or
Slippage.
(a)
Cleanmotor
oil
soaked.
spot
(a)
rapid
A
runningmay
tire.
If this
several
minutes
hum
this,
connect
under
an AC
speaker
controls
(2)
in
. I
volt
scale
between
minimum
This
is the
TROUBLES
Properly-
(35)
binding.
take up
spring.
slipping.
motor
broken.
bracket
loose
in
and leave
broken.
pulley.
except for
Function
and
3b)
slipping.
broken.
on rubber
pulley
motor
bracket
Ioose
in
and
leave
broken.
pulley.
Wow-
pulley,
(80)
thumping
indicatea conditiondoes
of
balance
voltmeter
"play"
only
spring
pulley
(59)
pulley
properly-
step 2.
properly-
binding.
(b9)
puliey
wittra
Replace
roller
running
roller.
replacedor
the
pot
an external
Use
"To
with
voice
coil.
clockwise.
position.
and
adjust
tubes
Vl
reading.
adjustment
(64).
puley
and
and replace
(70).
L/92',
to
pulley
and
replace
and
(47).
l/92,,
to l/6"
flywheel
petroteum
rubber
(80).
sound
while the unit
flatspot
not
clear up
time, replace
head
changed
(RB)
should
speaker
An External
a .Ivolt
T\rrn the.
place
put
the hum
and
V2 on iop
It
should not
required
(?0).
belt.
end
(4?).
belt.
end
capstan
solvent,
play
play
l/6"
and
rollers ii
ou the rubber
after
the
be
AC
the the
pot
is
PAGE 8
Page 9
(b)
If the surface of the rubber
smooth and
(c)
SUoUa
signs
wobbly, the roller
even,
the
of
excessive
replace the
bearings of the roller
wear or be extremely
should
roller
part.
be replaced.
is
show
not
shouldbe
imately replaced,
No.
With
longperiodof time. Approx'
sulficientfor
once a
lubricate the unit as
20 Motor
a
year,
or in the event that
Oil-
follows:
parts
.are
3. Tight
4.
5.
Stalling Or Binding-
l.
turned
running.
Should
trof
other
If
unit from
Speed
Tape
on.
(a)
control up and down
theabove fail,
(10)
hand manually
binding
Does
1.
Creeps Out Of Tape
l.
feed
(a)
Check
"Spindle
(b)
Lubricate.
preasure
Tight
(a)
Lubricate
flywheel
Tight
(a)
Lubricate.
control
Speed
This
motor
With
to the left
still continues it
case and free
Agree
Not
Broken
(a)
Ilead
(a)
menttt.
"earg"
Replace
(I4)
See
The lubricant
or take up
adjustment
End
Play
spindle
Adjustment".
roller
(56).
shalt
setting
should
"Play-Record-Erase
be done
turned
try
as
rotate take-up reel
With S,peed
entire motor.
improperly adjusted.
LUBR
applied at time of manufacture
"Oo",
several times.
holdingthe fastforward
far
as
will be necessary to remove
any binding
on motor drive
Slot-
ICATION
(I5
or
as described
(30).
changed
while
only when
try moving
it
go
wiU
action.
Setting-
and with the
spindle
pulley.
Eead
35).
under
unit
not
motor is
speed
con-
(35).
Mjust-
I; Take up reel arm
2. Feed reel arm
3.
Spindle
Flywheet
4.
5.
Pressure roller
With Staput
guide
the
CAUTION:
pressure
and
lation
tape as
tortion,
cloth
pressure
and
CAUTION:
No. 312 Grease Or
l.
Pressure
on the right
2.
On the
stud
Do not oil the solutely necesaary as excess
be thrown
pulleys
oil
as
pulleye
leum
use
carbon tetrachloride.
record-playback
The
roller
of tape coating residue,
passes
it
weak output and
and alcohol
roller.
Do not
when cleaning the as tbis
face.
(65)
bushing.
(42)
bushing.
(15
and
(56)
ptate (25)
of the
35)
bearings
(30)
side.
liJter
motor
bearings.
bearing.
Lubriplate-
at the slide
arm
bearings
(22).
off and cause
and rollers. Always use
possible.
and rollers wlpe off wit} a
solvent,
CLEANING
(30)
these
clean
to
use
could
If oil should
such as alcohol.
head
are subject
parts.
poor
the head surfaces, capstan
a brush or any metallic object
possibly
04),
which
This can cause dis-
erasure.
record-playback
mar the bead
buttons and
unless
oil
slipping
capstan
will only
of the
little
as
get
on
petro-
Do not
shaft
ab-
the
to an accumu-
is
off the
worn
Use a soft
head
sur-
o
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Page 16
Ref. No.
I
2
3
4
5
b
1
8
9
l0
ll
L2
l3
r5
16
T7
l8
20
2L
22 23
24
25 26
27
28
Part
No.
i00780-03?
r00780-035
310371
310372
450154 450155 460165
0r2687
012104
01268?
012704
310380
3r0381
600242
450151
450170
3r0358
310357
424177
100880
0ll3ri
0l13r9
580I.11
012383
l0l0i5
600243 200288
012328 012330
600241
01r316
012327
60013?
580056
4601u
Description
Cover Cover
TR-6?2)
TR-673) (Model (Model
TR-672
TR,-673
(Model (Model
Iftrob
lhob
Reel Holder
(Rewind)
(Rewind)
(Take-up)
Head
Head
Play-Record
(Model
Play-Record
(naodel
Cover Cover
Retainer For Reel
Holder
Model
ReeI
Holder
Model
Reel
Holder
Model TR-672
Reel Holder
Model
Volume And
(Model
Volume And
(Model
Top
Plate Mounting
Top
Plate
Top Plate
Fast
Forward
(Model
Fast
Forward
(Model
Brake Plate Brake
Head Holder
Head;
(Take-up)
TR-673
On-Off-Tone
TR-672)
On-Off-Tone
TR-6?3)
(Model (Model
TR-672)
TR-6?3)
Spring
Plate
Includes
Cable And Plug
Feed
Spindle, Includes
Washers Baseplate Foot
Switch
Screw
Slide
Pressure
Pusher
Set Screw
Pressure
Pads
Pressure
Lever
(4)
Button
Washer
Roller
Stud
Shoe; Includes FeIt
Plate
Screwl Retains
Washer
Pressure
Roller
TR-672) TR-673)
TR-6?2) TR-673)
Serews TR-6?2) TR-673)
And
Rewind Knobs
And
Rewind Knobs
Head
Holder
(4)
Arm
Assembly
Head
Retainer
MECHANICAL
(2)
(2)
Roll Pin
PARTS LIST
Ref .
No.
29 30
31
32
33
34
35
36
3?
38 39 40
4T
42
43
44
45 46 47
48
49 50
51
52
53
54
55
56 57
58
59
60
61
62 63
64
65
66
67
68
69
70
7l
72 73 74 75
Part
No.
580143
0i1236 420114
420L7L
460018
580141
0ll319
580141
i00660
420r09
600llr
46011?
012383
011330
420173
580156
4601I0
600247
olt317
0r1326
01i321
012324
420151
r00?60
380019
600242
01r694 490087
0ll?39
490089
100809
200288 600243
420186
0u329
420172
580156
460U0 490089
0ll3]?
680056 600256 420i81 200403 580082
Description
Cloth
Washer
(2)
Pressure Roller
Capstan Pressure
Slide Plate
Return
Capstan And
Capstan
Take-Up
And Flywheel
Spindle; Includes
Spring
Spring
Flywheel
Pin
Washer
Control
Record Control Control
ShaJt Bracket
Release
ShaJt
Sha-ft Retainer
Spring
Screw
Baseplate
Rewind
Spindle Arm
Arm
Spring
Washer
Retainer
Set
Screw
Spindle Pulley
Motor
Fan
Control
Two
Speed Control Bracket
Shaft
Speed Control
Spring
Lockwasher Washer Screw
Capstan
Rubber
Motor Pulley
Motor
Mounting
Rewind Driye
Take-Up
Slide Button
Shaft
Belt
Lever
And Flywheel
(Part
Of Motor)
Bracket
Belt
Washer
Screw
Take-Up
Take-Up Brake
Spring
Arm
Spring
Washer
Retainer
Take-Up
Drive Belt
Spindle Pulley Washers Screw
Foot
Switch Return
Foot
Switch Adjust
Spring
Cam
Retainer
Retainer
Washer
Roll
PAGE
16
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