My 5420 has a nut that I feel could be improved. It's some sort of greyish plastic material and has sharp edges. I'd like to know if anyone else has felt the need to tweak their own nuts, or which material is the preferred substitute. The slots don't properly seem to match the break angle, especially for the G string which comes out sideways half way down. Fortunately they are cut - possibly just moulded - to a decent height, though. I suspect that the tremelo might come back in tune better if I bunged some of the lead from my pencil into the slots. Has anybody taken any crude hand tools to grind their nuts down?