The vent spring is a small piece of tubing wedged in between the valve arm and bracket. The ballast servo is a standard Futaba 3003 or 3004 mounted to the bulkhead. The servo also supports some other items: antenna wrap; Lipo LVC; failsafe; etc.
Red tape secure anttena wrapped on plastic. Zip tie secures fail safe.
Sombra Labs RX is attached to bottom of servo - away from output shaft.
Servo is held in place with two bolts. Servo has round servo arm (wheel?), which is mated to the cam shaft that operates the vent and gas valves.
Spring tube turned up.
Spring tube removed.
Spring tube out.