Filling Too-Deep Guitar Nut Slots

nut slots - Discussion Forums nut slot depth There is about 1mm at the nut between bottom of the low E string and the fret board The Murphy's nut slots are not as deep Much more of the nut slot height So for a gauge the slot should be about deep, and for a gauge the nut slot should be deep If the top of the nut would be

nut slot files which i perceive as insane The nut length is 42mm Is that normal? did he do it on purpose? or because he had no proper nuts