Javelin thrower training device.
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Previously:
https://www.homemadetools.net/forum/...819#post179090
https://www.homemadetools.net/forum/...615#post178189
https://www.homemadetools.net/forum/...447#post177602
https://www.homemadetools.net/forum/...959#post144795
https://www.homemadetools.net/forum/...305#post126906