My Zorki 3M has a semi consistent light leak - consistent in that it affects every roll but inconsistent in that it doesn't affect every frame. The streaks run the full width of the film from edge to edge. I spent some time last night checking the shutter curtains (they're fine) and body of the camera (damn that thing is solid). The only potential issue I see is that the winding knob wobbles and appears to have a bit more gap than it should. Has anyone experienced this problem? Better yet has anyone fixed it? Any suggestions?