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I will remember this trick for torsion bars.... the heat would draw in the wax like a candle wick....
I know this has been mentioned in other posts. My machine shop showed me a trick I just couldn't believe. He showed me a plug that was rusted in a block. He heated up the plug with a torch than when it was really hot he put block of bees wax over the plug then it screwed right out. Apparently the wax goes goes down in between the threads. I couldn't believe it. It is amazing.
I've never tried that, before.... interesting...
Seeing how the plug is made out of steel, I would have placed a 5/8"-11UNC hex nut flat on top of the plug. Next step would be to fire up the mig welder and weld the nut to the plug through the hole in the nut. Step three would have been to remove the welded assembly with a 1/2" drive impact wrench.
This combination hasn't failed me yet.
Ron