I had to re-machine a piece of 70 year old Ebonite today. It's from the early 40's and worth about $2,000. I only had one shot at it and it had to be perfect. After nearly two hours of setting up, I began the machining, just a fuzz needed to be removed and not another one to reference from. Well, it took 20 minutes to machine the fuzz off of it and I lost a couple quarts of sweat in the process, but it was successful. I hate when they bring me these jobs.