RE: CAmodel Extra 2.3m Rudder pull-pull System
I successfully use a direct link to an 8611 servo with large (3D) control arm in my 40% Extra. The servo is the last of 3 servos in a row and has a JR servo output shaft support. So, you can directly link the cable to a servo. You can try this, and if you don't get enough rudder throw you can screw on a metal piece on top of the arm to give you a little more extension (If I'm reading that right, you have 3 inch full arm, which is 1 1/2 on each side). I did this and mine extends out to 4 inch full arm.
Don