Since I get soo many requests from “ pure tumb” pilots I developed something specially for tumbs, “WB No..4”... it takes mee quite a lot time too achieve perfect grip on tumbs and the same time ability too press button with just enough amount of force not too press it by mistake, it was tested by several pilots including heli 3D sticks bangers and 3D planes pilots and now it seems too bee perfect .
Stick have one top button. They can bee used for smoke, landing gear, lights,autorotation, rescue, flaps ect,ect
And they are more affordable since there is less work with them...