Hey don't get all mad! all he's trying to do is help you out. I can understand why he got that idea, you see when you say:
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other than that all vibrations are uncommon.
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it can be inferred that you're saying that all vibrations (aside from the engine) shouldn't exist. So in other words an electric heli shouldn't vibrate. And he's TRYING to explain why this might not be true, that's all.

Instead of getting all worked up every time someone gives you advice or information, try to hear everybody's opinion and advice because it might solve your problem. And we're not EXPERTS but many of us encounter the same problems and when we figure out the way to resolve them we let the rest know, that's why this forum exists. So if you think our advice useless then go ahead and read your books where "experts" speak the word of wisdom and tell you what to do, and don't waste your time posting or our time responding to someone who doesn't really care what we have to say.

I really hope you resolve your issue the way you want to.