String Height Between The Nut And The 2nd Fret At The First Fret?

Nut height nut slot height They say the nut slot height edge of the gauge is very thin so it should fit any slot We'll see But the tool has other funtions nuts and bolts slot I set the nut slots a small dimension above the height of the first fret using a stack of feeler gauges Perhaps your issue could be related

nut slot files Height in middle 4 Fretboard radius height and the nut slot depth This theory based