Again, I'm speaking in generalities, I'm not specifically addressing your picture. The point I'm trying to make is that not being able to back off the shoe adjustment without removing the drum is a poor design, period, due to the likelihood that on a rust belt car the "rust ridge" will mean that drum removal - even for inspection - is likely to result in destroying the drum, shoes, or both.
It doesn't work that way in practice. A well developed "rust ridge" does not simply flake off when you try to drag it over the shoes. You
*must* back off the shoe adjustment.nate