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Well, your Stiletto is the only Stiletto prop I have ever heard of vibrating so I doubt it's a Stiletto unique problem. Furthermore you report the vibration occurs with the three blade as well, so a freak defect seems extremely unlikely as it would have to have coincidentally happened to you twice.

I am further perplexed by comments you made in November about this prop elsewhere when you noted that:

I talked to the super folks at Stiletto and they are awesome! They sent me a Bay Pro III, four blade, 17" prop to try. I did that today and the results were perfect. No vibration, stellar hole shot with almost no bow lift, tight in turns and fuel economy very close to the three blade. Low rpm's keep it on plane too. This is the perfect prop for this boat. I believe all the suggestions of trim tabs and doel fins, etc. can be eliminated with this prop. The folks at Stiletto are incredible and so is this prop!

So, what has changed between then and now?