Rigging Pull-Pull rudder.
Slot is located by measuring for the point in the fuselage where the width=cable spacing, 2.5 inches in this case. The 2.5" comes from the servo arm and rudder arm hole spacing, which are equal. Servo arm and rudder arms were mounted vertically to lie on the top of the black paint line as shown. Cables were first rigged to the servo arm and then the servo installed. To retrieve the cables from the fuselage, I pushed a small nylon rod into the exit slot and fed the cable into it from the front. Pull the nylon rod out and the cable is magically in place.