I'm getting intermittent light leaks down my film which I suspect is caused by improper tension on the take up roll. My camera is a Bessa 6x9 folder, which I do not believe has any leaks itself. The film door has quite a reasonable light seal, and there are no other signs of light leaks in this camera.
I've noticed that the design of the camera has a small pair of springs either end of the spool at the supply side reel to keep tension as well as a small curved spring which seems to 'grasp' the reel. These seem ... well flimsy. The take up spool has only the small curved spring.
I've recently bought another camera (a Holga) which has a small foam pad stuck on the inside where the take up spool is, this seems to wind the reels much tighter (applying greater friction as well as pressure).
I'm wondering about modifying the Bessa to include this feature.
Alternatively it could be light from the 'red window' ... however this would then (in my opinion) appear on every frame (as I wind on with the window uncovered every frame) rather than just at random (if at all) intervals.
anyone have any thoughts on this?