loosen the strings all the way.loosen the truss rod located in the sound hole all the way.tighten the truss rod just untill you feel resistance.from this point tighten the truss rod no more than 1/4 inch and pull back on the neck to help the truss rod.if you tighten it any more you can damage the neck.it will compress the wood at the nut.also make sure you are tuning properly.personally 1/4 inch near the 12th fret is not that bad in my opinion.
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