Hi, Oh I just love getting new equipment without any instructions. Good thing y'all are here. I'm trying to load 665 pack P/N film into my new Arca Polaroid back. I t looks like the paper dark slide is supposed to go between the rollers, is that right? But I can't make it go there when the pack is in the holder. Then there is also a plastic dark slide that came with the back that fits in the other side of the back, but doesn't go in all the way. Do I use both dark slides? I've never used 665, only Type 55 P/N which looks entirely different and has dir ections on it! I need to be led through this step by step, including separating the pos and neg . Thanks.