In general, when you're trying to remove a stuck screw using heat, you heat the surrounding area (in this case, the bolster) so that it expands. Don't go crazy with the heat, but don't tickle it either...
Expect the PB Blaster to burn off as soon as you hit it with the torch, but it will go quickly.
Once you master the skill of removing seized screws/nuts with heat, you'll wonder why you ever struggled before....
If you don't overheat the metal (and thereby damage the temper) you can try it over and over...
Be sure to clamp the barrel in a vise (use hard wood or leather to protect it from the jaws) and get a dang good grip on the nipple. You might want to try the back-end of a 1/4-inch socket. You want the get torque on it without stressing/stripping the gripping surface...
Good luck!!
-Mike
Mike 'Bootsie' Bodner
Palmetto Sharpshooter's, Commander
9996V
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