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Can you take a picture of the gap and attach here. There should be no play or movement whatsoever between the body and the back when it's attached, otherwise you'll have light leakage. Is this the case with all of your film backs or just one particular back? Also, when you wind on after taking a shot do you notice any movement between the film back and the body?
There is 1mm play with the back and the body at the bottom near the hooks that hold the back. If I fit the bottom of the body and the back I can slide 1mm sideways back and forth. I shot a 120 film but saw no light leakage. Hardly visible in the photos, but you hear a small tapping sound when you move them relative to each other.
Thanks from Madna (The Netherlands)
Ok, thats a little more clear. Have you tried fitting different backs to the unit, and do you observe the same amount of play? There shouldn't be any play between the body and the back. I have a SWC which I can compare with, however I'm on the road, and won't be home for about 3 weeks. Perhaps somebody else on the boards can do a comparison.