Does anyone know where to buy a precut string nut. I just recently bought a no-name, deep bodied, a style mando on E-bay for travel. It has great volume and tone except the nut is too low at the e strings. They are almost touching the 1st fret. I want to replace it with a taller nut. I can remove the old one and re-glue another one on but I don's have any files to cut the string grooves. Any suggestions?