Originally Posted by
Antiquarian
Should I sand the interior "drum wall" too? I just cleaned it, it is rather shiny.
Yes. The drums look a bit glazed, possibly from contamination or simply being old. A fresh surface will allow the shoes to bite harder.
FWIW: I did not find Sturmey drum brakes to be all that powerful. Their advantage is weather resistance and durability. I doubt you'll ever need to replace the brake shoes.