Drill bit sharpening.
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Previously:
https://www.homemadetools.net/forum/...474#post177728
https://www.homemadetools.net/forum/...796#post183188
https://www.homemadetools.net/forum/...038#post120318
https://www.homemadetools.net/forum/...409#post169737
https://www.homemadetools.net/forum/...944#post171646
