Thanks for your reply to my question.
I was thinking of not having to take off too many parts to replace the brake shoes. I see your point in removing the flange plate I would have to remove and inspect the lever, cable, cable housing and cam shaft. I hesitate to remove too many parts since after 80 years I could damage the parts in trying to remove them.
In order to do a through brake job maybe these parts should be checked over although they seem to work OK. After removing the shoes I thought I would just try to remove the brake shoe anchor plate to see how it goes. There are four 5/8" nuts holding it on. Behind each nut is a knurled lock washer. I tried loosening one of the nuts and it broke free but the lock washer keeps the nut from turning more than a half turn. If I turn any further it seems like I would break the lock washer. Any thoughts on this?