Rear Drum Brake Help

I owned 1958 -59 Custom Royals & 1960-61 Dodges. They all had the 'total contact' brakes, which were also called 'centre plane' brakes. They were 11", the front brakes were a twin leading shoe design with each brake shoe having it's own wheel cyl. Brake adjustment was done via a 7/16" hex adjuster. Very efficient brakes, but I guess too expensive, hence the move to Bendix brakes.