I'm working for a company that has a old Lodge & Shipley lathe with 11-inch diameter, 6-jaw chuck. It's really tough to get a part to not runout badly. You can feel when you're tightening down on a part that the jaws are not all contacting the part surface evenly. I looked into having it rebuilt for them, and was told that for a 6-jaw that size, buying new would make more sense. There's no way they are going to buy a new one at $1,500 to $3,000. I'm thinking about the possibility of setting up some type of grinding tool on the cross slide, clamping the jaws down on a piece of material at the very back (They're 2-5/8" deep/clamping surface) and grinding the jaws in. I suppose to finish the furthest back area where I was clamping down to locate the jaws, I then have to clamp down on a piece out toward the front (already ground area) with a hole through the center where I might be able to reach into the back with the grinding wheel and finish the rear of the jaws. Sound crazy? Anyone tried something like this?