I think I have 12 x 2 shoes. It looks like 3400 takes 11 x 1 3/4. Can anyone confirm?
Measure the dia meter & the wear surface on the drum. If that was the case you couldn't be that close. There should be some freeplay in the crossbar..
Do you have the shoe with the short lining in the front? Maybe you could post a photo of the brake assembly.
George