Prize goes to Muz
In the same drum, one shoe was 40mm wide (203x40) and the other was 50mm wide (200x50).
Ergo, even if you adjusted the brakes right off they would still drag against the drum face. In fact, the drum would be hard to put on in the first instance. All that brake drag means friction, which means heat, which means grease cooked out of an already failing bearing, which means we get the resultant "my wheel's fallen off" call...
You should see the stub axle, I'm surprised I got a bearing seated on it!