I agree Ledyard Sensei…some things are hard to convey digitally. It has to be felt since we are dealing with subtleties.
But I do try to train in keeping your center even when you lose your balance.
http://www.youtube.com/watch?v=n21usSaXlYU
In this clip I chose to take over early in the technique but I also like to train to feel what can happen further down the line. In order to practice this you have to actually commit to the attack and have your balance compromised. But it is just one method.
Thank you for your contributions.
AH