After 20 years of using regular needle files I finally upgraded to diamond grit needle files. I still just use needle files.
I once read a very convincing article on the shape of the nut slot that suggested a square would be best especially considering someone who may use a Bigsbey or some sort of vibrato with a standard nut. A circle shape, the string, in a square slot will have only 3 points of contact (maybe even just two) and have less friction then a circular shaped slot that hugs the string all round.
Just thought I'd bring that up as a point of interest and discussion.
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