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Re: Tips on loosening screw
FWIW, I was also told (and have not enquired further) that a lot of Japanese equipment did not use Philips screws. Electronics and camera equipment from Japan often used Reed-Prince and other screws that are very similar to Philips--but just different enough to mangle them. This is supposedly because Philips refused to license patents to "the Japs".
Dunno if that's all bunk, but I've learned that there's a lot of variation in what is and isn't a genuine Philips head screw, and the quality of the drivers.