5/16 is a good idea, thanks. I think the problem I'm having is everything I'm finding for a v belt (mostly A type, 1/2") is on a 1/2" or larger bore, while the smaller pulleys (6mm and up) use PU Round belts.
I tried those with timing belts. It seemed they were not strong enough to turn the display, which isn't that heavy, maybe 30 pounds total (roughly half a sheet of plywood).
Ag99JYD OP t1_iz0ni1n wrote
Reply to comment by dr_xenon in 8mm driveshaft to 1/2" bore pulley by Ag99JYD
Oh, that is awesome! Thanks!