I got a few of these and so far, so good (multiple re-uses)
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I just received four of these 620 spools from FilmPhotography Project. They are well-made quality molded hard plastic.
Before I ordered a set I communicated with the FPP people about using the spools in a Kodak Medalist. They had no concrete experience, but did say that their spools are slightly oversized and if the Medalist was tight the spools might not work.
The spools are slightly oversized. The end cap pieces are a bit thicker than a metal 620 reel. ~.020" (1/2mm) thicker on each end. So the total extra length of the reels is .040 or a bit over 1mm. I assume that the moldmaker couldn't go thinner on the end caps and guarantee straight parts. Other dimensions are fine- the opening width between the two end caps, where the film and paper sit, is perfect. The diameter of the end caps match a metal 620 reel.
In my Medalist (I), the FPP spools will fit in either position. But in the feed position, it is tight and the spool does not move freely at all. I will most likely not use them as feed spools to avoid too much pressure on the spool and film. In the takeup side they are also snug, but given that this side is driven by the advance knob they should work well.
JohnMeadows, are you using them for feed in a Medalist?
I might try shaving down the end caps on a lathe; if so I will report back how it goes.