The Rudder is held onto the back of the CHASE with two screws that pass through the holes on the Rudder and through two aluminum spacers. The spacers fit into two sleeves in the back of the Hull. Do not lose the spacers and the screws, when you replace the Rudder. Remove the two screws to detach the Rudder.
Hint: It will be easier to detach and re-attach the Servo rod while the rudder is disconnected from the Hull.