All good advice.
PB works as good as any.
No WD ( water dispersant)
Whack it once a good 'en as if it were a nail and you were wanting to drive it in deeper, the shock usually helps.
Now we know it is tight because you broke the dam thing off so it is
goot"N" tite.
So get out the oxy/ace and heat the block around the bolt.
then clamp a good pair of vice grips deep in the mouth and carefully wiggle it
tight/loose, you don't want to break it off, you just want it to turn, ever so little,is good as it will move more as you work it.
Another whack with the hammer will help as you try to turn it.
Heating with a propane torch is like pissing on a forest fire, use oxy/act.
fast, hot and concentrated.
It may take several attempts.
main idea is don't break it off muscling it too much, take your time getting it to turn, just a smidgen works as it will get better as you work it.
BTDT it works.
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