Chris's camera pages
How to reconnect the aperture setting pointer on a Retina IIIc
Remove the lens, it just turns anti-clockwise about 20° and lifts out.
Loosen and lift out the locking screw. Be very careful, the screw is small an easily lost.
Unscrew and lift out the retaining ring. Don't use the tip of a screwdriver, use a wooden toothpick or similar. The finish is easily scratched.
Lift the centre ring with the number plate out.
Lift off the black aperture scale ring.
Lift off the speed setting ring complete with the fine pointer follower ring, but leave the shutter front cover plate in place.
Here on the underside of the speed setting ring you can see the thin tab from the aperture follower ring that connects to the aperture pointer.
Make sure that the "B" tab in the shutter is in the slot in the cover plate, not trapped underneath it.
Here you can see the fork at the back of the aperture pointer that the thin tab fits into. Put the shutter speed setting ring back in place making sure the thin tab drops into the slot in the pointer, and turn the speed setting ring to align the tab at the top.
Note the small notch on the back of the aperture scale ring, it fits over the tiny upstanding tab on the pointer follower ring.
Fit the aperture scale ring in place. The aperture scale numbers should be at the top.
Put the centre ring with the number plate back on. The number sits at about the 9 o'clock position and the ring should locate over a pin. Rotate back and forth until it seats correctly.
Screw the retaining ring back in place, the stepped surface goes to the shutter, level surface outwards. Remember to use the toothpick, not a screwdriver
Tighten the retaining ring until the shutter speed setting ring noticeably feels tight to rotate. Back-off the retaining ring to the first available locking screw hole. Check the speed ring again. If it turns smoothly, fit the locking screw, else back-off the retaining ring one more position.
Put the lens back in place, the tab aligns with the red dot, turn clockwise to lock.