Ok, I give up: how does one remove the chuck? I found the three square-driven locks (I think) and turned them CCW. I felt what might have been a release in the center of the turn; perhaps I retightened by going past it??? Anyway, a gentle tug was not enough. Do I need to give it whack like an R8 tool? If so, where?
BTW, the lathe is still pallet-bound. I think I am close to being able to sling it, and am headed out for proper cribbing before the attempt.
Bill