Knife throwing machine.
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Previously:
https://www.homemadetools.net/forum/...245#post126597
https://www.homemadetools.net/forum/...978#post207089
https://www.homemadetools.net/forum/...184#post191818
https://www.homemadetools.net/forum/...370#post185272
https://www.homemadetools.net/forum/...787#post148248