Vacuum flame-licker engine.
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Previously:
https://www.homemadetools.net/forum/...387#post150781
https://www.homemadetools.net/forum/...806#post148290
https://www.homemadetools.net/forum/...131#post138215
https://www.homemadetools.net/forum/...2320#post76150
https://www.homemadetools.net/forum/...052#post137975
