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I have an old Canon AE-1, and the shutter stopped working. I opened it up, here's what I found (pic is from youtube): my magnet does not stay stuck to the copper coils (red box) when I wind the film (the arm with the blue arrow should push the magnet towards the coils). I played with it mechanically and managed to fire the shutter once. I'm guessing the magnet is dirty and that's why it won't stick? I'll try cleaning it, but I'm open to other suggestions.