Yup - z-bend. That leaves a clevis at the servo arm for adjustment. Was there an option between connecting the control rod z-bend to the servo arm leaving the clevis to connect to the horn? This would allow you to easily remove the control rod from the horn by separating the "tines" of the clevis and making adjustments by releasing the clevis and making 1/2 turns in or out. With the z-bend at the servo arm it's simple enough to remove the servo arm from the servo (screw) and simply twist the servo arm around and off the z-bend.