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Struggled for hours with a stripped screw on a Cessna 172 cowl hinge

It was a standard Phillips head on the lower cowling that someone had clearly over-torqued before. I spent almost three hours trying every trick, from a manual impact driver to a left-hand drill bit, before it finally came out. What's your go-to method for dealing with a really stuck fastener in a tight spot?
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2 Comments
the_viola
the_viola6d ago
Did you try @linda305's valve grinding compound trick yet?
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linda305
linda3056d ago
Ever try a dab of valve grinding compound?
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