Cheap alternative to guitar nut files?

Alternatives to nut files? nut slot files I bought MusicNomad nut files for those If you need just retouch the slot, an old round-wound string of the matching gauge can work too (or the nuts and bolts slot 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 poker What do you folks use to file the grooves in nuts? I'm using a cheap China made set of guitar nut files and I sure would like to try