Dick H. ( a long time Jensen dealer) told me he had the workshop #100 molds at one time @ found one guy who had the old type of machine that could still accept these dies and had a few NOS parts made from them , there was some kind of issue (I think he kept them to long) @ made Jensen a little nervous and they demanded them back. I assumed they were metal molds , Anyway he sold me nearly all his stock of workshop #100 drive pulleys and I have them to this day. These pulleys are not strong enough in they're own right to turn as is (the spokes break) I had to make a jig that would clamp down on the outside rim and machine them that way , there are 4 different size #100 drive pulleys.