Should I not use APC on my airplanes then? The only reason I'm checking prop tracking is to get a smoother running plane without all the massive vibrations that I've been experiencing. I have no doubt that my drive washers and crankshafts are straight; these engines have not been crashed and the Saito has only been run twice on the bench; otherwise factory new. Should I switch to a different propeller and try again?

Thanks for the replies
Mike
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