My FM2 has decided it doesnt want to work any longer. the film advance lever will no longer work. I took the bottom plate off and messed with the mechanical pars a while. I could then move the lever by holding the double exposure lever , but it still would not advance the film take up spool when I released the button. I can roll the take up spool by hand like when loading film. The lever will not move past turning on the meter tho. I think some thing has jammed the gears on top. I am considering just replacing it with maybe an FA. It still bugs me that it quit, and I don't know why. I have an FE but it only goes up to 1000 shutter speed I miss the 4000 of the FM2.
My question is . Is there anything I need to pay special attention to when I remove the top plate?