Hole finder.
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Previously:
https://www.homemadetools.net/forum/...524#post209035
https://www.homemadetools.net/forum/...615#post201400
https://www.homemadetools.net/forum/...334#post200239
https://www.homemadetools.net/forum/...198#post195791
https://www.homemadetools.net/forum/...576#post132469
