Combination drill and tap.
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Previously:
https://www.homemadetools.net/forum/...474#post185601
https://www.homemadetools.net/forum/...213#post149939
https://www.homemadetools.net/forum/...791#post136958
https://www.homemadetools.net/forum/...786#post136934
https://www.homemadetools.net/forum/...663#post182618