Apparently, the pressure plate (later, flat version) is the key, not the thin metal rollers. Those can be successfully repositioned to the very edge, i.e. near the rubber/plastic rollers. Filling the holes in the plate seems to help with film flatness as well. I'm still waiting for the detailed explanation and pictures from Colin Turner in the UK, who's had a RH-50 modified and had used it with IR 70mm film.
Andy Buck's reply:
"It's been many years since I did that. I sold the back several years ago after Kodak radically increased the minimum order of 70 mm film. My memory of the back modification is that I just eliminated the two rollers. The opening was widened just to the top of the rollers, making an opening about 124mm wide. I simply wound it twice. That lost a little film but I wasn't concerned about. I did not increase the height at all. Good luck. It was fun while it lasted…
Last edited by darkroom_rookie; 04-16-2013 at 04:40 PM. Click to view previous post history.