Cheap nut slotting files?

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I saw a YouTube video, where a guy gave two options to cheaply but accurately file nut slots 1 ) Cut little notches in the edge of a feeler

Nut Slotting, nut files How To, Tools and Technics Electric Guitar Nut Files Our tempered edge-cut nut files produce round-bottom slots, to ensure that the strings seat properly in the nut without buzzing Each chrome-alloy steel

sugar pop slot files such as a Grobet needle file cut a very clean slot Top One type I find handy for nut slots are screw slotting files They Comments207 · Buy Files From Stew Mac! · Changing the nut on your electric guitar