Even so, those never really stopped the movement. When I was using these, I took to placing something heavy behind the rear foot, or putting the foot next to a wall. Then I'd push the display back with the foot stationary to the angle I wanted.
Alternatively, and I have seen this, you can put a short block of wood under the rear foot. That tilts the display forward so you still have the viewing angle you want, and the foot stays extended to it's stops. End result is you aren't messing with the foot because it's fully extended and you still get the display angle you want. You can adjust the angle by the thickness of the wood block you use.