TM 9-1829A, April 1944
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2021-07-07
Back off thumb screw of hair spring puller (T-66296) and place claw around staff and under center of hair
spring. If insufficient clearance under hair spring to admit claw of hair spring puller, use hair spring lifter (T-
29 Det. 3, fig. 27) and pry up hair spring far enough to allow claw of puller (T-66296) to enter. Tighten down
thumb screw until hair spring comes off (fig. 58).
Note: This releases the speed cup and staff from the front
jewel bracket. Do not lose the tiny fiber thrust washer on the pointer staff.
Figure 58: Removing hair spring, using puller (T-66296)
f.
Remove front jewel and hair spring regulator (fig. 59):
Using
1
/
4
inch open-end wrench (T-185488)
remove front jewel nut and hair spring regulator. Unscrew front jewel from bracket.
Figure 59: Front jewel assembly
g.
Remove second and third gears:
Remove gear bracket by taking out screw (fig. 54). Lift out both second
and third gears.
h.
Remove magnet (including first gear):
The second gear must be removed before the magnet can be
removed. Assemble body of magnet dismantling wrench (T-170654) to threaded neck of frame, backing off
handle so that wrench body will tighten down snugly to frame. Then turn wrench handle clockwise (fig. 60)
until collar is pressed off the magnet shaft.
Figure 60: Removing magnet shaft collar, using dismantling wrench (T-170654)