I have been trying to improve the nut on my F5. Before, all the strings were filed below the top of the nut. The distance to the first fret is good, so I don't want to alter that. All I really have done is file down the nut height to where it's at now in the photos. In looking at many Collings for reference, it looks like a good portion of the string sits above the top of the nut. Is there standard reference, 1/2 or a 1/3rd of the string above the nut, etc?
Another aspect I'd like your feedback on: The strings are sticking quite badly when tuning. I have not used any graphite or other lube. I'm assuming that even with a perfect nut cut, there is going to be some sticking without graphite - correct / incorrect? I have the little round nut files and lightly ran them thru the slots (without going deeper). Would it help to go slightly larger with the file size, i.e. 40 string / 42 file, 26/28, 15/17, 11/13. Anyone found a better lube to use than pencil lead?
Sorry for the multiple questions, and thanks for your feedback, advice or sharing in advance.
PHOTOS OF NUT https://photos.app.goo.gl/fJAa8GWydM8iYZfX8
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