The prop that Gregg tested with the defective hub was a Hi-Performance 22" pitch 2-blade bronze prop that I bought new on e-bay, but the prop is from the 1970's. Guess rubber weakens with age. Was hoping that it would be a fast prop, as I have never tested it and am saving it for the 1988 115 HP Merc. Just glad that Gregg's Merc did not blow up with the high revs.