| or the neck is warped. is the neck completely flat, or does it curve up at the first fret? adding some relief back to the neck would help if this is the case, unless it's real bad, in which case you're hosed.
but, yeah, might also be the nut. +1 on the shimming.
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"master your instrument, master the music, and then forget all that &%$# and just play" charlie parker
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