I have a used Calumet C2 roll film back and have no instructions on loading film. It is obvious how to load the film, but I see no mark to position the loading "arrows" on the roll film backing.
If you can't find anything else, thread the film through, close the back, pull the dark slide a hair, and advance the film until the edge of the tape holding film to backing paper appears in the gate. Slide the dark slide in, advance the film a little, zero the counter (I assume this can be done) and go. Best to try this with a roll of scrap film.
I recall that this topic was address in the Forum a while back, probably within the last three or four months. If you can't locate those posts with a Search, just send me a PM and I'll be glad to help.
Just forgot--the advice above from Dan seems logical, but setting the counter to Zero when the opening frame is in position will put your last couple of exposures beyond the end of the film and onto the backing paper.
I have a used Calumet C2 roll film back and have no instructions on loading film. It is obvious how to load the film, but I see no mark to position the loading "arrows" on the roll film backing.