A Fender nut is a small, metallic piece that’s used to safe the strings of a Fender guitar to the neck. You will need to arrange the Fender nut accurately in an effort to be sure that the guitar performs in tune and that the strings are on the appropriate peak above the fretboard.
There are a couple of alternative ways to arrange a Fender nut. One widespread technique is to make use of a nut file to file down the slots within the nut till the strings are on the appropriate peak. One other technique is to make use of a shim to boost the nut up or down.