Arbor Support Outer Brace Swapability

pjb, sorry so long responding. My 1.25" in #17 above simply refers to which NMTB 50 tool holder size I needed to put my home made spline drive in. You have the real deal spline drives from VN! So, yes, the spline is 1". Hope someone here got the NMTB 50 - 1" spline driver you found!
 
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