Rail nut tightener.
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Previously:
https://www.homemadetools.net/forum/...511#post182018
https://www.homemadetools.net/forum/...497#post181952
https://www.homemadetools.net/forum/...308#post181121
https://www.homemadetools.net/forum/...856#post179197
https://www.homemadetools.net/forum/...075#post134237
https://www.homemadetools.net/forum/...314#post158015
https://www.homemadetools.net/forum/...050#post149352
https://www.homemadetools.net/forum/...572#post147444
https://www.homemadetools.net/forum/...144#post120921
