Preparing rudder parts continued today with the rudder spar, reinforcement plates, counterbalance rib, and tip rib. I final-drilled the spar and reinforcement plates as well as the rudder horn, bottom rib, and shim. I then put a slight radius on the forward end of the counterbalance and tip ribs to enable them to fit easier in the rudder skins. The final step was adjusting the flanges of the ribs to ensure they were square and the ribs lie flat. I have a scrap piece of marble, which provides an extremely flat surface to ensure pieces are not bowed and to flute as needed. The picture shows the top rib on the marble piece after fluting to straighten it out.