These are readily available on eBay for a few dollars each (in batches of 6-10) or around ten bucks a pop for singles, or you can buy already spooled film from B&H or Film Photography Project to get new spools.
Instead of rewinding 120 to 620, use a snip to reduce diameter of 120 film spool edges to that of 620, so as to fit and turn freely at feed. To ensure proper spacing a 620 spool is required for take up.
one problem with takeup spools is the substantial difference in size and configuration of the winding key interface between 120 and 620.
My Kodak Brownie Hawkeye will only take 620 film but will accept a 120 reel for the exposed film. So I too am looking 620 spools.
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