I have a 1989 O M C Cobra trolling motor and can't find model # on unit need prop. It has a 8 1/2" two blade prop with a 3/8" shaft that is held on with a carter pin the drive shaft has a pin in it that fits in a slot inside the prop hub I guess as a drive pin or shear pin. one blade has a crack in it won't last long. THANKS for any help OTTIS
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