Factory spec for cutting the nut slots?

To cut nut slots I start by setting feeler gauges for the height of the 1st fret + , that seems pretty safe to avoid cutting too deep, and then I

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

nut slot height The G0's nut slots are deeper Therefore, only a bit of the low E string is sitting above the nut There is about 1mm at the nut between bottom

nut slot files I've actually done this using a thin sheet of metal on a beater classical guitar that came from the factory wiith the nut slots cut too low It