Alternatives to nut files?

tonewood Gauged DiamondCut™ Nut Slotting File Set for Acoustic Guitar: https: io

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 slot files In this video, I will review the Hosco brand guitar nut slotting files Help support this channel

nuts and bolts slot into this purchase? I'm a cheap son of a gun, so I don't like the idea of paying lots of hard-earned for tiny little nut-slot files