I was configuring a new bag today, and was fitting it for my Hassy.

The little crank on the magazine got flipped out and turned a little advancing the film. This has happened to me before on an A16 back, and I ended up with overlapped frames.

I of course, have to have the back loaded with chrome... but i'm less worried about wasting a frame than I am about overlapping one. Will the turning of the crank on this back result in an overlapping frame which can be avoided by burning off a frame with the lens cap on, or, will it simply increase the spacing and put the last frame either partially off the roll or farther onto the trailing end of the film?