Continued work on the frozen rear brake. Attached the brake arm lever and it still wouldn't budge. But while giving it some whacks with the rubber mallet, I noticed that while the cam wasn't turning, the entire backing plate was spinning around within the hub. So I kept whacking it, slowly spinning it around, until eventually it got loose enough to where I could pull it off.
Discovered the whole thing was just frozen with age and corrosion. The cam was stuck so tight that I had to knock it out with the ballpeen. But mechanically everything seemed sound. Once I'd cleaned it all up by sanding it down and using liberal amounts of WD40, it all went back together nicely.
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