Just a wild guess... Someone put the misfit brakes and drums on the original backing plates because they cant find the correct drums available anywhere.
I think your right. So they rub the backing plate? Put a few more washers on. Good to go.
Just kidding don't do that.
Can you really not get 10" replacement drums and the correct shoes? Or did someone just cheap out and cobble together what they had laying around.
Last new set I bought was in the early 90s. Been using larger B&C body brakes since then.
