I have my dad's Zenit EM, and l still shoot with it sometimes, although the advance lever feels like the gears are a bit stripped since it does not work smoothly, and sometimes the mirror won't go up when depressing the shutter, even though it fires. The 'solution' is to tip the camera with the lens facing downwards, and then wind it gently. I've been thinking of getting another EM for parts, to repair my dad's camera, it would mean the world to him.