Robert may also not like to hear this, BUT, I think I told him to get his guy to make him a different nut than the Tusq one. Although, given a bone or brass nut blank and a sander and vise, Rob already has the tools to craft the nut slots and do a complete nut, start to finish. As I hear Brass and Bone mentioned, if I remember right, those years Gib was putting Robot tuners and Zero frets on their guitars led to some issues since the Zero fret wore out fast, being made from brass I think it was.
I am surprised no one has ever made a nut from stainless steel like some fret wire is made from. Supposedly those frets last a real long time.