I have essentially a "bionic" right leg- reconstructed knee and 2 pins, 6 screws, 1 plate, and some wire in my ankle. Luckily for me I have enough range of motion that I can operate the HST foot pedal. I have not "blown" anything out in my left leg yet (but I eventually will according to the "professionals") so I can easily operate the clutch at this time. After years of running a geared tractor I know that I really do need an HST type transmission at this time and in the event I physically deteriorate further in the future. "Aging ain't for sissies" and "you do not age gracefully nor well" are two gifts (ie quotes) expressed to me by former clients. Jay