Quote Originally Posted by R.Gould View Post
Had it happen a couple of times on an old Fuji 645 folder, and once on an ensign 820, with the 820 the trick was to make sure the film was wound tight at the start, with the fuji it was random what ever I did
I bet the amount of play or backlash in the feeding axis on the Fuji was such that it allowed the feeding spool to slide up or down which influenced the take up spool. Just throwing stuff out there though.