Hi Stewer, I tried the link to the Python script on your page, but got a missing page error. I think you have the best solution proposed so far, since I don't necessarily want my feet to be locked in the Y-plane, but instead to not drop through the floor. I can cope with feet that lift slightly when shuffling or sliding, but I want to be able to walk or jump as well. I'll try your link again later. Again, thanks to all of you for your responses and shared wisdom.