Pulled the valves. Holes appear to be the same size. It does look like the block that won't "shut off" has the holes drilled off center of alignment. The block with the working 0 has the holes drilled on center. Pic attached. Now I'm going to have to pull some other valves....... dammit.
Sean, it looks like the Type 3 is going to stick out just a bit further than the Type 1. It's the nub in the center of the dial that puts it over the the length of the Type 1.