Ok playing around with my Specktrum DX5e ive figured out how to make the ratchet stick self centering i took the radio left over from my Matorro KT converted to HL electronics and removed the 4 springs form the two sticks took 3 small screws and removed the metal ratchet tab on the DX5e and added 1 spring on the bottom and 1 spring on the top then to get it to center more added a spring from the top to the center of up and down stick to center it you may have to use diffrent springs to set up how you want it to fill but it works here are some pic .

Thanks
Jimmy