Stump drill.
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Previously:
https://www.homemadetools.net/forum/...733#post167318
https://www.homemadetools.net/forum/...917#post152808
https://www.homemadetools.net/forum/...102#post138134
https://www.homemadetools.net/forum/...9299#post89007
https://www.homemadetools.net/forum/...786#post167416