Evan, try gluing a piece of sandpaper for an air file inside a brake drum, and scuff the brake shoes back and forth against it to match the radius. Since anybody who uses a brake lining grinder these days is likely to get 30 days in the electric chair, that's a pretty good work-around!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!