I just bought my first polaroid film for a Polaroid 100 back that I got a while ago. I got Polaroid 690 film which seems to be the right kind. So far so good. However, I cannot figure out how to correctly load this thing. I put the film pack in the latch with the film surface facing the glass. Now what do I do? I know I'm not supposed to feed the leader through the rollers but what do I do with it? Do I fold it back? Do I fold it under? Can anyone help me with this? I did a few google searches and downloaded a couple of manuals but none of them are very helpful.