Contouring the linings to the drums is a pretty simple do it your self job- - - -no fancy equipment needed- - - -Find some 60 or 80 grit sandpaper made for a body shop "air file" and glue a strip to the inside of the brake drum with the grit facing inward. If you use a water-soluble glue like original Elmer's white glue, it comes off easily with some hot water. Scuff the brake shoes inside the drum until the contour of the lining matches the drum. "Rinse and repeat" for all eight linings, remove the sandpaper from the drum, and clean up the mess. The brakes should really impress you with their stopping ability!
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!