Blade pitch stall marginTwo things spring to mind
Two things spring to mind. The reason the cyclic stick movement is limited by a ring of metal at its base, is that the cyclic stick tube is both of a larger diameter and thicker wall than the push rods, so the base of the cyclic stick would seem an obvious place to control excess movement without loading the pushrods to excess. On the adjustment of fore/aft, I think Mr Robinson could not get equal movement each side of centre due to the bellcrank setup on the mixer. Or may be he thought "Better give it a bit more aft cyclic, they will need that when they are about to put two grooves in Terra Firma. Either way, when you try designing one youself (control linkage) its a real ******. That Mr Robinson is a very clever chap. (sorry to deviate from the thread, the wine has done me head in)