I have a vibration probe at work that I can check it out with. My feeling is if I can eliminate all the vibration then I should do so. I'm not saying that I expect perfect balance in every prop, only that it should be a lot closer than what I've encountered. Next time I get one way out of balance I will be sure to pass the problem back to my LHS or APC.
ORIGINAL: Kmot
That video demonstration was very interesting. Seems to work well on very large props. What about 10" props?
Fancman: I find it hard to visualize how the hub being out of balance could make much difference, on an object that is 16" in diameter. Have you ever run an 'unbalanced' hub prop and measured the vibration, then run the same prop after balancing and again measured vibration?