Brian- Then how do you explain the above scenario where one blade grip has a blade attached and the other one just has a weight attached to the blade grip. People(not me) have seen it fly without vibrations. I believe that this scenario is exactly what you have described as not going to work. Not being inflamitory or anything, I'm just wondering like everyone else. I must admit to being one of the "sheep" that uses a koll balancer and I do not have any problems with vibration. I don't know the math or science behind why it works I "just do it" and it seems to be fine. I must admit that I don't know why or how my TV,VCR,Car, and computer work either, but I'm a trusting soul.
VD