Re: Kuzushi for kaiten nage
Like Michael, I cut at the elbow, not the wrist, using the back of my leading hand and dropping my center at the same time. Its something I picked up from Sugawara of Hombu Dojo. Its very difficult to cut the head and the arm at the same time, so I dont try. I usually cut against one or the other, and then uke will fall into position.
Against ukes who are hard to unbalance using the arm, my sempai has a version where his cut is agains the head and the back of the other hand is placed against uke's elbow basically to keep track of him and to have it there waiting for when uke lurches forward. The power comes from the tentai and the cut done simultaneously.