The rudder servo and horn were next. The rudder servo was mounted in the existing tray made from a honeycomb fiberglass composite. Gold Nyrod pieces were used for screw mounting as before. In order to figure out where to drill the rudder horn screw hole, the servo with ball links was put in place to measure down to the center of the links. This measurment was transfered to the outside of the fuse on both sides. A long straight edge was run from this mark, through the precut cable hole and a mark made on the rudder over the ply plate. The mark ended up in the lower third of the ply plate on each side. Once satisfied that the marks are in the right place and set back from the leading edge of the rudder an equal amount (double check by measuring from the trailing edge of the rudder in case the angle sanded into the rudder leading edges are unequal) a hole is drilled part way through from each side for a 30 mm bolt. The rudder horn is made up from 2 med MK horns. The center bolt is a 3x30 mm bolt with the head cut off. The bolt is just long enough but could be longer if you can find a slightly longer 3mm threaded piece.