Fret crowning with a chisel

I tried this yesterday and it works.

To restore the crown to your frets after levelling, just run a sharp wood chisel at a 45 degree angle a few times along both side of the fret. I used an old credit card to protect the fingerboard.

Hoax

I believe ya.
The idea is really to form a fresh "minimal point" for the string to work from.
How you reach that is not the issue really.

Altho i presume a fretfile does a more neat job of it..