for using a trem a graphtech nut would probably be the best permanent way about it, as it would be a permanent method, whereas lube or putting pencil lead (ie graphite) in the nut grooves arent permanent methods, so you would need to redo it with every string change to keep the nut smooth
if you are having trouble with the strings sticking in the nut, it might be because the slots arent cut as well as they should be, so maybe getting the nut recut could help alleviate any problems. a badly cut nut can be a pretty common source of tuning problems, especially with trems
David
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