Nary a clue.

Making/finding a new belt shouldn't be all that hard. If they're still in business, easy, of course. McMaster Carr might have what you need. McMaster-Carr.

Yeah, boring. Very. But, wonderful for smoothing one out. They don't take kindly to mashers!

During the Winter I've done a training program at a local Physical therapy joint. One night/week. Thus far I'm the only person to have ever shown up with rollers. The rest were a wee bit nervous, and got down right excited when the rear tire on my bike blew last Winter. I departed the rollers, but didn't crash/fall over, or anything remotely exciting. Suffering with others makes it all more palatable. The leader is a sadist.

Anyone have a set of shake and bake Cinelli rollers? They were awful from a noise and vibration standpoint. Oh, and my Father did make a new belt for them. Don't have a clue whatever happened to them, they are certainly not in my junk box.