Thanks, Gents!!! I really appreciate the kind words!
I can't find one of the resin plugs I used to make e tires, but I do have one of another tire I did. In the pictures, you will see what seems to be a plug and that is pretty much what it is. I basically machined a plug so that I could slide the tire onto, then once I pulled the resin out, it gave me material to clamp in the three-jaw chuck, in the lathe. Despite my best efforts to have the tire on the plug and trued, it still wobbled once I took it out of the mold. What I didn't realize until later, is that I could chuck in with the tire in the chuck, true the plug part and then reverse it back to machine it. The other thing I realized is that the tires aren't perfectly round either, so once you have the pieces to glue and piece the tire back together for the master, I couldn't get it exactly now I wanted it (good enough for gov't work, though):