I don't know much about vibratory rotation, but just enough to see that what this fellow is discussing is perhaps very pertinent. What do you think?
Part 1
http://www.youtube.com/watch?v=ekGJC5HF ... re=related
Part 2
http://www.youtube.com/watch?v=mvRaQnaK ... re=related
Part 3
http://www.youtube.com/watch?v=Nq4hjm-W ... re=related
