Here's what I’ve done for the elevator. It's a fairly simple way to go. You'll notice the servo lead is coming out the bottom of the elevator but will be inside the boom and run down to the wing then into the fuse. The servo sticks’ out the bottom of the elevator about 1/4 inch but will be covered with a plastic faring and painted white just like the real Bobcat when larger servos were installed in the elevator. These fairings are available from DreamWorks. The Servo is a GWS MICRO 2 BB METAL GEAR SERVO it's rated at 75oz in Torque.
I'm continually impressed with the construction of this acft.

Galen