little help please

mrose, here is how I installed mine.

There is a setscrew on both ends to tighten.
the smooth end I just ground down a flat spot on shaft
started a drill bit so setscrew slightly indents the shaft.

Or you can go crazy and drill thru shaft and use bolt or pin.
Set screw on spline end is suffient. IMO
Flaming river makes longer ones but are very expensive, if you need longer withcolumn issue.

dave