#1
I have a stratocaster with a standard fender tremolo and im not sure what kind of nut to use. 've heard graphite, roller and locking nuts used.
#2
Are you replacing the nut? I wouldn't put a locking not on it unless you have a locking tremolo. Graph-tech and bone nuts are good for tone and tuning stability. Never tried a roller nut but I guess they work too.

The idea is that don't want the strings to get caught in the nut, so they always return to the same position (and pitch) when using the tremolo.
#3
TUSQ is more conducive of sound and has better lubrication than bone as they're impregnated with teflon. But for deluxe strats, LSR roller nuts are used.
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