Perhaps the newer members of the Minox community do not know the name John Birkby. He invented (and produced) a small film cutter, called Zipslit, something real simple, but it had a good run within the community for some years. I myself used it for some 8 or 10 yrs, heavy slitting 35mm to Minox format, and it stayed true and reliable. Alas, this item is no longer made and it is unavailable currently. I still have mine, but the blades are somewhat worn and chipped. As the blades are regular cutter blade sections, I probably try to replace them, in the future.