Overhead drilling jig.
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Previously:
https://www.homemadetools.net/forum/...806#post198288
https://www.homemadetools.net/forum/...533#post201072
https://www.homemadetools.net/forum/...334#post200239
https://www.homemadetools.net/forum/...643#post159272
https://www.homemadetools.net/forum/...666#post147721