I have a TMG Dover Strat. Great guitar with the best of parts. It has a Callaham aged tremolo bridge. It has a bone nut. When I use the trem everything goes out of tune. I know I need to lube the nut. Will pencil graphite work or is there some secret something that will do it better. I have heard of nut sauce but never seen any. What is the best way to keep it in tune while using the trem? I only use it lightly.