I moved on to to front brake.
I'm determined to get a working hydraulic caliper using the original Speedway disc.
My first attempt was a no go caliper was to small & didn't open up enough to fit disc and vintage wheel wobble....
So I got a larger caliper & so far it's looking like its going to work out well.
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I drilled & taped another hole in the caliper bracket and was able to mount caliper where it needs to be. One bolt is not going to cut it so I'm working on a bracket to solve that.