Oh btw, don't try to roll Fuji onto a Kodak spool. The Kodak is not wide enough and it crimps the Fuji paper. Ilfords reel is in-between. The "inside" spec's by digital caliper is Kodak: 63.01mm; Ilford: 63.04mm; Fuji 63.22mm. (your mileage may vary). I'm sure spools vary, but I'd only use the take up spool of the brand I'm shooting.
Now I think I know why the last roll I put through my Koni Omega 100 came out with the edges of the backing paper all crinkly.
I had no idea, thanks for the heads up.
Now I have to check my empty spools.