Completed step 2 page 07-04. Riveted rudder horn assembly to the R-1202 spar. Checked all rivets with rivet gauge and also measured with digital micrometer to compare to Mil-Std requirements. Completed step 3 page 07-04 riveted remaining R-1203 ribs to R-1202 spar with LP4-3 rivets. Completed work on preparation of rudder skin.