It's pretty simple. Turning the nut clockwise shortens the threaded side of the truss rod which is UNDER the solid bar of the truss rod, thereby DECREASING the bow of the neck caused by the tension of the strings. Turning the nut counterclockwise increases the length of the threaded rod which allows the neck to bow more (ie gives it more relief)
...and yes, .011's and detuned tuning causes the strings to have less tension, which in turn causes the neck to have LESS relief
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disclaimer I don't know anything, everything I say is a guess, estimate, hearsay, or opinion. For your safety, don't assume anything I say is a fact. Research
Last edited by LeightonBankes; 03-19-2018 at 11:15 AM.
Reason: more info
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