I just bought a john boat with an 89 15hp sears game fisher motor. I need a new prop, mine has a small chunk missing from one of the blades. All my research has shown they no longer produce the props that fit, and I have had 4 boat repair or propeller shops tell me they cant help me. Is there any type of hub adapter that can go on a 10 tooth spline with the through pin? I find it hard to believe this whole motor can be rendered useless because there isnt any way to attach a new propeller.