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you need the OEM part, or it will shear again. go to brp-johnson literature, engine diagrams, and get the part #. the shaft and wheel has to be clean and free of oil, when installing.
If I were a gambling man, I would bet that it is a special size. Haven't seen standard size woodruff keys in Johnrudes for a very long time, unless they have started recently...which I seriously doubt.
