Threading in girder nuts.
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Previously:
https://www.homemadetools.net/forum/...874#post217089
https://www.homemadetools.net/forum/...691#post216340
https://www.homemadetools.net/forum/...263#post211382
https://www.homemadetools.net/forum/...704#post182755
https://www.homemadetools.net/forum/...364#post196514