Installing the rudder control horn:
Assemble control horn as shown.
Temporarily install the control horn, cut out around the base like we did for the aileron
and elevator control horns. You can also use tape around the base that will keep glue
from getting on the covering. Once the covering is removed below the base plate, leave
the horn in place and attach the other ball link. Next, push the control horn in the slot in
one direction until you can see the holes in the center. Apply glue to the area and push
the arm back to center. Make sure it is perfectly centered using a ruler.