M4 issue

place the film in the camera with the leader inside the tulip. Make sure the cassette is properly seated and the film is aligned properly. DO NOT wind on with the back open. Replace the baseplate, THEN wind on. This is by far the best loading method, and it can be done in just a few seconds. Works flawlessly every time.
 
The rewind lever is not going to make full revolutions each time you wind on, it may move just slightly or not at all, depending how much slack has built up in the cassette. If you want to check mid-roll, you may tighten it slightly before you wind on (just turn it like rewinding, but don't touch the little clutch on the front - stop when you feel resistance). At least mine is like that and works well. Unless you are seeing problems on film, your camera was likely fine before you took a screwdriver to it.
 
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