Internal threading a large part.
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Previously:
https://www.homemadetools.net/forum/...799#post223644
https://www.homemadetools.net/forum/...414#post228146
https://www.homemadetools.net/forum/...950#post224109
https://www.homemadetools.net/forum/...676#post190072
https://www.homemadetools.net/forum/...870#post223811
