I did like Bob suggests. I got a spare aluminum prop when I picked up Kerri On. I like aluminum as if I do hit something hopefully the drive train survives intact and the prop bends. Stainless props can survive real hits but bend drive shafts. Props are cheaper. I had my spare 13 1/4 by 17repitched to 131/4 by 15 for Powell It will be fine as a coastal spare also. Easy to swap out from docks, dingies or beaches. George