FWIW, a 1/16" diameter rod of 1144 steel would yield at over 300lb of tension (which would go up to over 1200lb yield strength for an 1/8" rod). So all of our truss rods are way overdesigned, by quite a fair margin. Basically we're loading up the neck with all the mass of the truss rod just so the threads at the ends will be functional.
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