As you probably know this group of patients really likes to keep going once they are.(so I avoid stop-start) Do they need a lot of support or is it just to back them up in case they do loose balance? In the Parkinson clinic of a hospital I used to work they used a lot of " A-frames" (aka delta frame I think). 4 wheels, Handbrakes (!) and a seat. Ofcourse they need sufficient strength to control the brakes. But it is safer then the push-down brake option. They often can not apply them in time and may fall forward. The other thing they did was having the handelbars pretty high so that they actually don't lean on it much (again just some balance support). Bey Bey