I have seen various of these over the years, where a plug is punched out and then forced back in. Possibly from a high school shop class.
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You must already have the 15-20 Degree variety of these then?
I'm holding out for at least 45 Degrees. 8-)
The things you can create with I'm assuming a hydraulic punch - cute little puzzle I suppose.
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Discoverer of 1919 Mercury Dime DDO - FS-101