Rebar coupler.
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Previously:
https://www.homemadetools.net/forum/...894#post102785
https://www.homemadetools.net/forum/...590#post182258
https://www.homemadetools.net/forum/...325#post177187
https://www.homemadetools.net/forum/...300#post177085
https://www.homemadetools.net/forum/...760#post152183
https://www.homemadetools.net/forum/...063#post120436
