#1
Ok, so I really need to level out my frets, but proper fret files are ****ing expensive SO would a nail polisher file thingy work?

I don't know what proper fret files are like so it's probably a stupid idea but if it does work that would be awesome
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#2
well... depending on what you're doing it might work. If you're trying to level frets out, no.

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#3
You need something with some decent length, thats pretty straight and wont bend. A nail file isnt gonna cut it to level frets. A good knife sharpening stone might work for leveling.