Captain,
I think something is being lost in translation here. The wheel cylinder is the small hydraulic piston that actuates the brake shoes on each wheel. It should be held on with two small bolts that go through the backing plate.
Is this what you are referring to. There is a large round hole in the backing plate that a machined step on the wheel cylinder goes through. This machined step has the bleeder and the threads for the brake line in it.
Does yours work this way too!
Stuart
