Fred Cain in Wolfeboro sells them too. I have the exact same motor and prop setup. The motor is a simple well pump motor with a splined shaft. The prop has a small set screw to hold the prop in place.
Mine were getting all rusted out so I just built a few made out of PVC piping. Going to see if it works out this winter. Heck. I thought it was worth a shot before having to weld more up.
