At some point because of problems like this(good drums) we should start considering disc brakes, since almost all parts are readily available.
Ed
should consider?, or, might have to consider?
My 1954 3100 brake drums/parts are in excellent condition.
Over the past 25 years, I keep/kept my my eyes open for used/usable brake drums.
I have two spare sets of usable brake drums.
I hope my grandchildren will not have to worry about replacements.
(when I am gone in 30 years - I plan to live until 100, encouraged by Denny Graham).