Rebuilt about 15 Superchucks, a few plain bearing chucks, the only hard part is getting the sleeve off. Used different sized copper pipes, and at times PVC pipe, along with a 20 ton press to get the sleeve off. Surprising how much force is sometimes needed to get the sleeve moving; one old chuck took 10 tons for the sleeve to move, bit scary when it let go. It can be sometimes be done without a press or vise but it is not easy, can take a lot longer. The next rebuild I plan to heat the sleeve to about 175, should make it a lot easier, even with a press.