I have a friend that owns a machine shop and takes on special projects now and again. I was talking with him about making a film slitter for the Kodak 70mm infrared film, and he's willing to help out. Now I know there are two folks who cut and respool this exact film in 120. I've purchased from one of the two individuals in the past. Unfortunately, it appears, and I've confirmed this with him, that with his slitter he has to pull the film through it. This has produced a number of very fine scratches over the length of the film. He did offer to replace what I had left, but since there are only two rolls, I didn't bother with it. I was wondering if anyone knew of a site that deals with the design of film slitters? I'd like some design considerations for a design that doesn't require pulling the film, but secures it in place while one runs a slitting blade the length of the film. I do love the Kodak infrared film, as it always had that glow about it, and 120 was a usable size. Thanks in advance for your thoughts.