Graph Tech TUSQ 6 String electric nut 43mm x 6mm

One of the key causes of tuning frustration is string binding at the nut. An inexpensive and quick solution to what you need are TREM-NUTS. TREM-NUTS alleviate the binding grip of the nut on the string and reduces friction between the nut material and the string. This is accomplished using a nut manufactured from an engineered resonant base material impregnated with a non-stick coating.