Ah! I see what you mean now, I am Kind of Unknowing in the area of 4 wheel Height adjusters, As few American Mowers have them...
Not many American mowers have Axles for that matter, as the wheels are simply screwed to the flimsy edges of the base and picot around the bolts that are holing them in.
I agree 100%, What that guy was doing was Idiotic at best, Showing off that a lawn mower can simply whack down large volumes and cough them out a tied-open Back flap, is a rather poor test of the mower, Because Just cutting is only part of the story, If I were going to Demo a mower to sell I would show It Cutting High grass, Low grass, Mulching and Catching Not Just Ramming through a thicket with the back open...
Kori
