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I wish I knew the physics of the wax technique. Mostly the lore will refer to beeswax, though I just used a common birthday candle. The wax seems to wick into the interface just like a well-fluxed sweat soldering. I doubt a heat gun will provide the heat you'd need, and you might wind up cooking seals if you try to warm it up a lot - better a torch, oxy-acetylene or more conveniently, Mapp gas in a Bernz-O-Matic, so you can focus the heat and deliver it quickly and precisely before the tranny soaks it up.
An impact driver is a hand tool acquired by anyone with 60's era Japanese motorcycle experience. Sears has them. You strike it to rotate frozen fasteners.
The filing down and wrench resizing is a technique I've attempted to use on eroded exhaust system hardware; finding a wrench of any caliber to pound tightly over the bolt head. I don't recall having a lot of success that way, and mostly wind up getting out the cutoff wheel.
The pin spanner idea sounds good, if it was a bigger plug (with more span between the pins) otherwise I'd think it would be too weak to do the trick, and you still risk drilling through when you make the holes.
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Art Benstein near Baltimore
When the smog lifts in Los Angeles, U. C. L. A.
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