And now, the rest of the story...
My chuck was binding and didn't want to close down all the way. I thought is was an issue of lubrication, and maybe some burrs. Took it apart, cleaned everything well, then did a dry fit and found a couple of the jaws were not sliding smoothly in their grooves in the chuck body. The jaws are numbered, but there are no numbers on the chuck body, so it was trial and error figuring out where they belong. Interestingly, the jaws only fit one way; jaw 1 slides smoothly in one groove, but doesn't slide in the other two. To improve sliding I took a small file and deburred all the edges. That fixed jaw 2, but 3 was still binding. More filing, and it got better. Next, a touch of lapping paste, working the jaw back and forth in the groove got it into decent, but not perfect shape. I washed everything, again, and I'll take one more look at everything and then assemble. I'm going to use a light coat of lithium grease. Wish me luck...