I was asked a while back how I made the tires in my service station from O rings. Perhaps this will help to explain it. It is actually simple, first I mount the O ring on a piece of brass tubing, held in a hemostat, then using a cut off disk, I flatten it out a bit. One flattened is shown next to the mounted O ring. Next I heat a piece of screen , I have a few different ones, but these were done on a piece of the Spatter screen I got for a buck at the dollar store. When the screen is red hot press & rotate a section of the "tire on it. It cools very rapidly so you have to do it in sections till you get all the way around. Not every time produces a tire , sometimes you ruin an o ring, of course with a little work these can become "blow outs" for the station scrap pile . I use a wire brush in my dremel to clean the burned rubber out of the screen every couple of sections. Thats about it , let me know if any of you have any luck with it.