The bottom rudder cap (fiberglass) has a series of challenges. I've elected to make mine removeable, so I installed nutplates rather than rivets. Also, the taildragger stinger interferes with the rudder cap so it must be trimmed differently to increase clearance. Did that and it looks good. The next issue is the front of the cap makes contact with the aft fuselage with rudder full deflection. I elected to remove this area, make scarf joints and add new fiberglass cloth. For now, I've added two plies of 9 oz. weave. Later, I'll make things look nice with micro and sanding. Appears to fit much better than before and no longer rubs the fuselage.