A little input from an amateur with some experience. I have studied Littlebrotherblues instructions on setting up a National guitar. His instructions are great. But when I fit a new National biscuit on my guitar, I use a smaller and finer file for removing excess saddle material. I have ruined several saddles by using a file with a coarse profile. I have cut the slots too deeply before by not recognizing how quickly a nut file will go through maple. Saddles and National biscuits are cheap. Have fun working on your guitar.
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