We stock an extensive range of replacement top nuts for electric, acoustic and bass guitars.  These are made from the latest synthetic materials designed to decrease friction whilst enhancing sustain and tuning stability. It is often extremely simple to change the nut and a light bit of levering will prize away the old one. You could even go all the way and buy a blank one with which to cut your own slots for the ultimate in customization! (Don't worry, they also come pre slotted too!)