Ed -
Congratulations on finding a novel way to free it up.
One more solution that I have used successfully is to simply put a few drops of "Liquid Wrench" on the screw and let it sit for a few hours. This will loosen up any old lubricant gum and/or rust and allow you to turn the screw.
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Mauser720 - Ron
"Those who do not know history are doomed to repeat it."
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