How often do you blow your nut? No, not that! Blowing ones nut is when after so carefully filing the grooves for the strings on the bone nut, that is filing each string groove with a special rounded file that fit the string exactly, that just before its done, at the almost there, but just a little more stage you stroke the file one two many times. One stroke (no, not that kind of stroke) is all it takes to go too far and now the string sits too low and buzzes when played. All that's left to do at that point is throw the damned nut away and start over. Blowing the nut is commonplace for me, and is frustrating. One would think I would eventually get competent at the seemingly simple job of filing a nut, but so far I get in much practice. Someone once said "He who works with his hands is a laborer, He who works with his hands and his mind is a craftsman, and He who works with his hands, his mind and his soul is an artist".