Way back around 1980, the G-string slot on the nut of my 1965 Jazz Bass cracked and the string kept popping out. I took the repairman's advice and had a brass nut installed. Now I want to go back to an original-type nut, but I don't know if the factory nut was bone, plastic, etc. Does anyone know what type of material the original nut was made from? Where can a get a replacement nut that best matches the original? I'll have a local shop cut and install it, but I want to purchase it myself. The picture is of the bass as it is today - original except for the nut, the pots (which died one-by-one) and the bridge pickup was rewound by Lindy Fralin.