Karl Townsend wrote:
... Get yourself a dremmel or die
grinder and the right diameter stone. ...

I have diamond bits for my "Dremel", but I still take to a professional*
for sharpening. But, I use the saw so little that it's not worth trying
to save the time & cost. Especially since he does such a good job -
much better than I can do.

* - NOT the hardware store with some monkey running the grinder!

Bob