Nitrous chainsaw.
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Previously:
https://www.homemadetools.net/forum/...185#post203769
https://www.homemadetools.net/forum/...148#post199488
https://www.homemadetools.net/forum/...228#post199790
https://www.homemadetools.net/forum/...454#post116921
https://www.homemadetools.net/forum/...126#post134426