do what's already been mentioned and you'll be fine.
I got mine(now sold off when I sold my 4x5 Alpenhause last year) and it was really stiff. A bit of white grease(Krytox???) on the septums, then wipe it off, smooth as butter.
just make sure that the back "clicks" locked when you're advancing film(like johnielvis stated), or you'll keep re-exposing the same sheet.
-Dan
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