ADJUST THE GIMBAL CENTERING SCREW
When changing between Modes 1 and 2, or between Modes 3 and 4, the gimbal
centering screw must be adjusted on both gimbals to enable the centering spring
on the elevator gimbal and disable it on the throttle gimbal.
1. Use a small Phillips screwdriver to tighten the gimbal centering screw. Tightening
the screw will disengage the centering spring.
2. Using a small Phillips screwdriver, loosen the opposite gimbal centering screw
until the lever engages.