RE: Self-centering made cheap.
Great minds think alike....LOL. We have been using the rubberband trick on the Spectrum radios at Danville for quite a while. We even use them to convert the landing gear SW for the main gun switches into a momentary switch. For radios where the dash pots are hard to convert attach two of the small Tamiya springs to the joystick at the face with small screws. Not very pretty but cheap and effective.