I mounted the 12" faceplate that came with my import metal lathe and noticed that it is not even close to running true. My first thought was to take a facing cut on the face and true it up, but upon further inspection, I noticed that the flat surface at the back of the mounting plate (where the cams come out) doesn't sit flat against the head stock. I pulled the faceplate to ensure it was clean and free of metal chips and other debri. It still won't sit flat at all. I flipped the faceplate around and mounted it to a 3 jaw chuck and was able to determine that this surface is flat and true. What else might be preventing the cams from pulling the faceplate flat/tight against the headstock? Is there anything I can do to correct this, or is it easier to leave it and go ahead and face the front of the plate?
thanks in advance, Nick