Want to Buy WTB: 620 spools

I'm amassing a collection of 620 cameras, and would like to have a few extra spools to re-roll some 120 film on to. I already know about the 120 trimming trick, but some of the cameras either won't take it, or it's so tight it might stretch the film. If there's anyone that wants them, I can provide some 616 spools in exchange for 620s.

In most of 620 cameras my son bought, there was empty spool. But none in 828 or "Bantam" format cameras. It's so hard to find them!