A couple of changes for the rudder servo and linkage. First I swapped out the JR 8411 for a Futaba 9156. My Fly Navy Flash will have 9156's all the way around. The reason I did this was because I had a hard time finding an aluminum servo arm for the 8411 that would accept a clevis. Here I used the Blue Futaba arm. In order to use the clevis, I had to mill down the top of the arm a bit. You want it just thin enough so that the clevis pin goes all the way through and fully engages the hole in the clevis. Unless this goes all the way through and seats in the other side of the clevis, you wont have full strength from the clevis.