How do you widen a nut slot on a guitar?

nut slot depth   Dan nut slot files

Below: A 130″ file was used for the 5-string B, seen at left of nut Note that this is not filed to final depth; this will

Logically, the nut slots should need no more clearance above the first fret than would otherwise be required between the first and second, Guitar Neck Ruler Bridge Slot Depth Maintain Measure String Height Nut Slot ; L · 40, 8, XXL, 12 ; XL, 42, 10, 3XL, 14

trimless linear slot diffuser Below: A 130″ file was used for the 5-string B, seen at left of nut Note that this is not filed to final depth; this will Once notched - use a thin straight edge from the nut slot leading edge