I have a Jacobs 14N 1/2" chuck for the tailstock of my lathe. The MT2 arbor it is mounted on has spun in some past life and is a bit munged up.
I ordered a new JT3 to MT2 arbor for it, but now I find I can't budge the existing arbor out of the chuck. It's not rusty. I've soaked it penetrating oil for about a day. I tried heating it with a torch and then later by baking it in the oven. Quickly cooled the arbor with a wet sponge while the chuck was still several hundred degrees from the oven. I've succeded in slightly bending a Starrett center punch trying to pound the arbor through the center hole in the chuck.
Any tips on things I could try to break up this long-term relationship?