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Originally Posted by geronimo
TR,
I'd get a heat gun before I went to the torch. Less chance of burning/melting the paint or metal around the screw.
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Guys, You might find this useful. When I have to take apart a high value screw that's been chemically locked into place and flame heat would ruin or discolor the surrounding material. I take some 1/4 inch brass rod, taper one end on the lathe to fit the screw head, hold the rod with vice grips and heat up one end of it with the torch. In a semi-dark room this temp is judged by the beginning of incandescent color (glowing red) in the brass rod. I then place this rod directly on the end of the screw to be undone and wait a moment. Then I remove the screw with whatever wrench or driver it calls for.