Tubing joints.
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Previously:
https://www.homemadetools.net/forum/...144#post180375
https://www.homemadetools.net/forum/...802#post152317
https://www.homemadetools.net/forum/...913#post137451
https://www.homemadetools.net/forum/...919#post119767
https://www.homemadetools.net/forum/...664#post132916
https://www.homemadetools.net/forum/...688#post136656
https://www.homemadetools.net/forum/...3330#post77845
