I found one listing on a Google search, from another old car/truck site. Try a Google search for "Barrett Brake Doctor". There's a pic of the unit in a box, but nothing showing it in use. As I remember, there were several adapters to fit different spindles or axle flanges, and a high-speed grinder disc that put the radius on the shoes. Asbestos dust everywhere, even though it had a "dust catcher" bag on it!
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!