There should be numbers on the outside of the hub next to where the prop shaft pokes through. Hopefully you did not bend that , although I suspect you have a aluminum prop which takes the brunt of the force vs a SS prop.
SO im still trying too pull this off haha. Anyways, should i stick to whatever size prop this is.. or? Its a 72 cobia, center console fisherman. 19.5, 115hp,