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7/25/2016
The chuck from dp#15 above was very easy to remove from the spindle. On the other end of the "effort-to-remove" spectrum, was this chuck from dp#20. The threaded collar was missing and the chuck sleeve was broken.
I tried and failed with a slide hammer on my first removal attempt. I then pulled the sleeve of the chuck and removed the jaws and split nut. My last resort was to drill a 5/16" hole through the chuck inside the jaw cavity to the spindle. I was then able to use a puller to remove it from the spindle. I then saw why it was so difficult to remove; the previous owner had use some kind adhesive to attach the chuck to the spindle. The taper is badly chewed-up. I'm surprised that run-out was so good. I'll likely need to use green Loctite on the replacement chuck.