@Jeffro I have been in your situation with allen bolts many times. When they are that stubborn, you are limited in what you can do...
Heat and cold help - that is, put the entire vise into an oven at 200F for a few hours and the whole thing can heat up safely - don't go higher unless you want to ruin your paint. Even 200F is a little high. Use computer cleaning spray to cool down the head of you socket head cap screw. Use lots of acetone with only a few % ATF to seep in really well. Use a good quality impact Allen socket on an impact gun.
Even with all that, sometimes you just end up breaking the allen bolt. no big deal. You mill out the old one, and put in a new one. that's what we have milling machines for!
I was reading the messages, not the thread DUH. I do have an impact. Thank you to all. I will repost on progress.unless my wife sees It in the oven. No doors on dog house.
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