I just picked up a 1972 Espana classical guitar. Unfortunately a previous owner took two of the nut slots down far too low, so I have to cut a new nut. When I measured this nut I realized it is only around 6.5mm tall at the apex; the nut only stands about 1mm above the fretboard. That seems very short. Is this short nut normal, or did someone do a crap job cutting the nut?