I've gotten decent results slitting 127 from 120; I use a long threaded rod with nuts & washers to position a hobby knife blade in an otherwise uncooperative Spartus Full-vue. The 61mm 120 film slices into 46mm for 127 and 16mm (for 110 in my case). One or both will be a tiny bit narrow which compensates for inexactness. The hardest part is cutting the slit film to length and taping it to the backing paper.
127 film
in Classic Manual Film Cameras
Posted