Fixing an old battered Leica M4 is not a job for the faint-hearted. Paal Audestad found the used Leica M4 at a thrift store in Oslo in 1987, and the camera cost 2200 kroner (US $400???). He used it until 2000. Leica found out about his “love affair” with the M4 and decided to see if they could fix it.
Besides general cleaning and lubrication, here are some of the other fixes that were required:
Replacing the Rewind button
Replacing and adjusting the distance measures
Adjusting the winding mechanism
Clean, lubricate and adjust the shutter
Adjusting the shutter lock
Adjusting Rewind
Adjusts the focus mechanism
Clean-looking
Change search window
General mechanical adjustment of all parts
Read the article at : Leica [Google translation]
via Leica Rumors