If you go on the Well Tempered web site. they have a section on making a jig and the type of monofilament line to make your own belts. I'm surprised the distributor can't help you. The gentleman you should talk to is Mike Pranka. He had helped me in the past.
Well Tempered Amadeus Belts
Anybody know where I can get replacement belts for a well tempered amadeus ii, neither dealer nor distributor can seem to get me any despite multiple requests.