Coupler Removal and Install

Travis,
What will happen with that loose fit is the coupling and shaft will fret. The fretting will get worse and worse, to the point where it will even pound out the points of the set screws. Those set screws by the way are in there as a safety. I have seen the fit get so bad that when the boat was put in reverse, the prop shaft and prop went back and hit the rudder. A spit coupling is certainly a good option. The other option many have gone to is a double taper shaft. Bothe ends have the taper so both the prop and coupling are solidly held on with the tapers. That option is more money but, the option also makes it easy to remove the coupling easily.