We are restoring a 1938 Studebaker back to original so have been having to make some of the parts; they're not available like a Ford or Chevy. Metal parts we can always make and with rubber parts we can recast or find one close, drop on dry ice and then machine. The dry ice treatment is fine for something that just has to have a hole bored or the outside turned on a lathe or milled but if it's involved it warms up and starts hanging on the cutting tool. I made a bracket to hold the high speed cut off tool to the tool post on the lathe and put a 1/16" thick wheel on it---anything thicker there was too much "grab" from the rubber and stooped the wheel. Still could only take off 0.030 with each pass but it left a BEAUTIFUL finish with the lathe screw speed set low. Only thing is you got to have the doors open cause the smoke is worse than any London fog and wear old clothes since the hot rubber dust really, really bonds to anything it lands on.
Evan ; Ever work in a tire re treading plant ? . The rubber dust from buffing the casings is incredible ~ I thought about it coating the inside of my lungs and got worried .