Once the film arrives, I would recommend slitting all of it down to 61mm. to do this, you do need to purchase a film slitter. Goat Hill Film Slitters makes lots of options, but the one we are looking for is the 70mm to 120 (61mm) slitter.
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FYI, Goathill is at www.subclub.org/sponsors/goathil2.htm
Their slitters have firm foam on the top and slippery paper-backing on the bottom.