Using Paterson reels with 120 film

This is a simple question. I have a plastic Paterson extendable film reel/tank, which I bought a while ago to process 35mm film, and I now want to try my hand at processing 120 film as well. Since I cleverly threw away the reel instructions, I can't work out how to extend the reel to accept 120 film. Is it just a matter of yanking it open with force, or is there a knack?

Many thanks
Matt

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8/26/2002 10:50:24 AM