Thanks for the help Don
Where can I find Exeter paper? I have been saving 120 backing paper toward an attempt to glue them on a bias to make wider strips and distribute the lap, but that is a grasping-at-straws thing.
I have also thought about a slitter to no good end- My best shot is to rig a razor blade(s) and attempt to pull the film thru it/them. Again, I just gotta get huevos to overcome the fear-of-frustration factor