[Alan Roehrich]

Robert, new springs might help them release faster, but that's just more pressure opposite the pedal pressure, so it won't help hold it.

Myron is correct, there is (or was) an arch grinder made to correct the arch on shoes, so they fit the drum correctly. Even when I worked in a shop in the very early eighties that had one, they were extremely rare, only a higher end shop that was pricey had one and had anyone that used them. It requires a person to measure the drum correctly, then set up the machine, and correctly set up the shoes. Adds a good bit to a brake job, so no one but the expensive shops used them. Back around 1982 or so, one shop in maybe 30 had one. It does make a real difference. Good luck finding a shop that does it now. Odds are, the owner is in his sixties, or older, and the shop is the highest shop in town, with a lot of long term customers.