I just received a Graph Tech tusq 1-1/2" replacement nut for my '66 Jbass with white neck binding. When I traded for this bass in the early 70's, I replaced the original (cracked) nut. I trimmed and filed the nut as best as I could back then. However, the E string has a tendency to pop off during "aggressive playing". So I thought while I'm restoring the bass, I'd replace the nut. The string spacing on the new Graph Tech nut is much wider than the apparent available width. If I shave off the ends to fit between the white neck binding, there will be very little material left to hold the E & G strings in place. Question 1. I'd like to confirm the radius of this neck? Based on Fender's 1966 specs, is it 7.25" or 9"? Question 2. Because of the binding, I'm thinking I need to make my own custom nut. Anyone know of a good source for a bone or tusq nut blank with the correct radius? Thanks for your help.