I've recently had the chance to buy a cheap 500 c/m body with lens a film magazine coming from a 500 c. The camera seems to work smoothly and fine, but the frame spacing is rather odd, randomly variing from 4 mm to 6 mm. All the frames are pretty usable, but I wanted to know if this behavior is normal or is a sing of incoming problems (I've been given a 3 mounts guarantee).

Xmas greetings,