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I know what the purpose of truss rod is for, and know one is talking about going crazy "yanking on it". Your telling me reducing the bow in the neck is not going to pull the head stock back and reduce the distance between the bottom of the string and the top of the first fret and in doing so create a lower action "to some degree" . Every time you change the gauge of your
strings you need to adjust your truss rod to compensate for it. If you put
light guage strings on a guitar that has medium heavy gauge strings the
strings may well even be laying of top of the first fret. Your not going to toss the nut and cut a taller one your going to reduce the tension on the truss rod and regain your proper proper relief which inversed.
I agree with you on trying to keep the neck as straight as possible. And it is a no brainer that you raise the bridge and lower the brigde for major adustment.
But on a new guitar once you put your prefered string on the the first thing your going to do is adjust the truss rod like you say to get the proper relief.
With out seeing the guitar and what is actually happening there is no way to
tell what it really needs but turning the truss rod nut 1/4 of turn is not going to hurt it UNLESS it is already at its limit. I actually think when you get everything else setup perfectly the truss adjustment is the last fine
increment to a setups action. Hey it works for me any way I have 23 guitars and 5 mandolins and have never paid a dime to some one such as yourself