I did a search for this but came up pretty empty. But I"ve noticed that my nut is about ready to be replaced. Once I unpack my tools and schtuff, I'll give it a go (I already had it shimmed once a few years back), but I wondered if the hipshot extender key wears out the nuts exceptionally quickly on the E string. Is there a nut material that is reputed to be tougher/more resistant to such abuse? I'm not super keen on the idea of a metal, as I suspect it'll be much harder to cut/tool than a bone or modernimpregnatedsuperconductivecoolnessfactorhighium nut. Any thoughts out there? Should I just go with Tusq/graphite and replace it again in 20 years?