^I like the ssr hd hub I have one in each of my props.
It engages metal to metal under load (solid) and has abOut 1/8" rubber cushioning when not under load to absorb shift clunk.
Mercury used their brains on this one.
Only down side is the must be pressed in pressed out. So it's good to have a regular hub for test days
Give 'em a callDo they offer it for a small shaft?