I like to use a round file without
the guide piece attached.
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There are several different size
files you can get, and it's important to have the right diameter.
My method involves pushing
the file with pressure from the short side of the angle towards the
long end. When pulling back reduce the pressure and repeat until the
resistance feels smooth.
It should only take a few
strokes to do each tooth. Some people will say to twist a little while
you're pushing. Easier said than done. I've found that rotating the
file after each tooth helps spread the wear more evenly. Replace the
file once the grooves get worn down. I think one will usually last me
somewhere around 10 to 15 sharpenings.