Big Bends Nut Sauce, Groove Luber, 1.5cc
Helps problems with string breakage and pitch drift. Easy to apply accurately and mess-free with the Groove-Luber applicator. Used by top players and techs!
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No upgrades available
I've been using this stuff since I came across it in the USA, most of the top Luthiers seem to use it on guitars in for a pro setup. Guitars stay in tune longer and you get far fewer string breakages, just put a tiny amount on anywhere your strings make contact, and hey presto your friction problems are GONE. A tiny amount goes a very long way so it isn't as expensive to use as at may seem at first.