I haven't gotten up the nerve to do this yet. Right now I darken my bathroom, open the box, pull off one length by spreading may arms apart, do it again, then cut it and roll it up onto a film cassette spindle by hand. I get between 30 to 36 exposures to a cassette by doing it this way and I don't have to worry about trying to rewind the roll onto something smaller. If I remember right, Tom Abrahamson did a little video showing this being done awhile back and it works pretty slick.