Okay, string height at the nut

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

The height of the strings from the neck of the guitar should be as low as possible without having any buzzing The depth of the nut slots on the open string

nut slot depth In theory, yes The ideal height would be just about the same as a fret's height in the same position as the nut In practice, I've found that there

nut slot height To check nut-slot height, hold the string down at the third fret, and see how much it moves over the first fret This is similar to checking