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I ran across this today while looking for someting else in a McMasters-Carr catalog.
Round Head One-Way Screw is the name of the beast. They sell a One-Way Screw removal tool that looks like a button spanner on the end of a screwdriver for around 16 bucks.
They do say that if the screw was installed by machine "tightly?" you will still have to resort to GUNSMITIN
Hank
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