Originally Posted by Laz (Post 4617185)

i thinking about trying this one

http://www.amazon.com/dp/B00004UDKD/...D&linkCode=asn

A high-quality industrial abrasive made for extended usage, 1/8" (3,2mm) shank. Ideal for sharpening, deburring and general purpose grinding on harder materials--including stone, glass, ceramic, porcelain, gemstones and nonferrous metals, Specially designed for working with conic surfaces.