You can go to your local machine shop and ask them to get you an
Industrial diamond set in a steel rod. They cost about $25.00.
I’ve used mine for about 3 years now and it looks almost new.
It’s great for shaping silicone carbide and aluminous oxide
stones too. Another product is a Norbide stick made by Norton
Abrasives Co. My Dad, a tool and die maker, gave me one about
10 years ago and I still use it to. I used it daily for about 7
years until I got the diamond. I suspect that I have worn about
.3mm off of it so far. The stick is about 75mm long to begin
with. I don’t know how expensive they are, but I know they are
NRA Endowment and