I took out my prop over the weekend. I have a new one on hand BUT the spline is not like the one i have. It will fit on the shaft but has no locking notches in it for the nut lock its just flat. hope you can follow what im trying to say as Im not sure myself. Is there a different nut I will need? is it just the wrong prop. B1 with a merc prop 454 power plant bolth props are merc mar somthing 21 pich. Who fixes props cheep as well. Thanks all you have been a great help in the past.