I had a problem with a 1925 MG that had been parked for 10 years with the emergrncy brake on. It seemed that no force on earth would free up the gizmos inside the hub and of course any application of " knock-er-loose" sprays could not be made to bear on the offending parts. I beat on the brake drum with a large hammer for long enough to wear out my arm to no effect. ( on the brakes
) then in desperatio0n I hooked up my pneumatic rivet gun and worked the drum over with that.
Almost instantly the rust began to fall
out of the drum and it was turning freely in a nounce! If you don't have an air compressor and a rivet gun then I guess you just take up golf for a hobby.