Roll 120 film onto a 620 spool in the darkroom. If no access to a darkroom, have someone at a camera repair or lab do it. You need the 620 spool, 620 was a little wider than 120. One can find the 620 spools in camera shops that feature older equipment or maybe someone here can recommend a place in your area. Any lab that devs. medium format can handle it, just make sure they keep and return your 620 spool! That's a great camera, good luck!(posted 8470 days ago)