Fire-activated pile driving.
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Previously:
https://www.homemadetools.net/forum/...985#post226751
https://www.homemadetools.net/forum/...994#post217532
https://www.homemadetools.net/forum/...962#post191112
https://www.homemadetools.net/forum/...968#post213801
https://www.homemadetools.net/forum/...028#post221132
