More on Sprockets:
There is a fairly new casting tenique that involves using urethane. It's similar to the"Lost Wax" method. It saves the cost of having molds made. Molds can be very spendy. Mine cost about 1000$ for the Brass Sprockets Mold and about the same for the ST25 (Variator "C" casting). Unless you plan to go into the manufacturing business it's a bit of an expense. If one spreads the cost over 30,50 or 100 pieces it's not so bad. I produced about 40 sprockets and about a half dozen ST25 castings. However with this New technique, the finished product doesn't require machining after it's cast and can be done on a one-piece basis. No mold means No big Cost$! what you need is a Brandy New Sprocket as a Template. I gave a Set of NEW, not replica, Factory sprockets to Warren Jones for precisely this application.Actually New style and Old Style, 2 sets. Hook up with him. There are a couple of places in Seattle and at least one in Tacoma that use this process. These sprockets were made out of brass specifically so that they don't wear out the grousers and side guides. I tried some steel sprockets and they did indeed wear out the grousers and guides. It was a mistake. The Brass comes in various Hardnesses. 2 hardness levels up with the addition of a lubricating agent, usually Graphite or Molibdanum tend to work best. The lubricating agent is alloyed right into the brass before casting. The Casting guys will Know what I'm talking about because they sell a similar product, or perhaps the same product, as a substitute for Babbit for rebuilding old machinery that has Babbit Bearings. It may be reffered to as "Bearing Alloy" or smoething close to that. Anyway it's a 'One Time' fix that seems to last forever and still doesn't wear out the guides and Grousers.