How do I modify the joysticks on the transmitter so they will hold position (as opposed to re-centering)?
Like many hobby Radio Controllers, this is a simple modification for the Vex Transmitter. Simple remove all the screws from the back of the device (9 total) remove the frequency module crystal, and carefully pull off the back panel. Then remove the springs from the joystick axis you want to be non-centering.
Take extreme caution with this procedure, irreversible damage can be done to the Vex transmitter!