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Author Message   Hovaness Tinkerer Username: Hovaness Post Number: 79 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, September 27, 2009 - 06:22 pm:    If you take off the bottom plate, you may find that there is a simple tolerance problem in the parts of the double exposure prevention mechanism. I have fixed several jammed FM10 cameras by just filing a bit off one of the locking levers. It is hard to describe the layout of the mechanism in words, but you will easily see what the parts in question do once you have the bottom off the camera. Evidently the manufacturing tolerances on these Cosina-made bodies were not up to Nikon standards.