Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I have found that you can have a crowned pulley & still have a small groove cut in the center for round belts & it will still work for both.

That's a good idea, two for one. I've used "O" rings, spring belts and the green
drive cord you cut and glue, for all purposes except one. The PMR 1/4" flat belt
for the governor on a Pomocy Steam Engine.