Hi. I have a Traxxas Link 2.4 ghz, 4 channel model number 2240. I'm trying to use the 3 position switch to control a Punkrc 3D dig. When I place the toggle in the center position it is the same as of the other positions. What this does is only allows me to turn either the front or the rear motor and not both at the same time, which is how this Punkrc 3D dig works. Please help!!!!