Replacing the film-transport sprocket on a Canon A-1

A few broken teeth on the film-transport sprocket severely hinder film movement during winding and prevent the frame counter from working. There is often no way to repair the part itself: it is made of hard plastic and cannot be glued back together.

It is one of the first parts installed when the camera is built, so it is also one of the last to become accessible during disassembly. The complete operation takes 2 or 3 hours, not including the extra time needed to film it.