Once I get up, and running with my new machine, and get my car back on the road, there will be this maintenance item. My car has a sintered iron clutch disc, after enough cycles, and abuse the disc face will need to be trued. The disc needs to be cut with a diamond cutter. I'm thinking face mill???? I do have an 8" rotary table with my new mill, and will be deciding on the best mounting technique. Maybe a 3-4 jaw chuck on the rotary table. Possibly an old input shaft drilled, and tapped to clamp the disc? Without the machine it's hard to visualize how to get it done.