Ikeda sensei shown the process at the beginning of this video
http://www.youtube.com/watch?v=PB6FJ-Via9U the hand on top isn't grabbing. he gave a number of ideas to try.
more idea from Endo sensei
http://vimeo.com/45046265
you got shoulders, hips, legs, the whole body, why focus on the hands?
question for you, what are the commonalities of the two sensei aikido?