Hello! I just bought a used Polaroid 8x10 processor from Calumet and have no instruction sheet for it. Though I understand how I have to insert the film holder, I'm not sure about the positive sheet. Can anybody explain it briefly? Also, how can I be sure that both sheets will be safely catched up by the rollers? Last but not least: does the processor have to be lightproof on the exit side of it? Even if I extend the rotatable cover to have the processor in an all-extended condition, it seems to me that light may come in on the sides of the rollers. Is the negative sheet protected from such light before it gets in contact with the developper paste? Thank you very much for any help!