I finally got around to fixing my screw up from post #251 on 4/12/16 where I cut off the ball drive stud too short.
I found with my servo mounting and SWB arms I could use three washers under the ball and the threads fully extended through the servo arm and did not need to be cut off on the back side. The ball is now fully seated in the recessed drive slot in the flaperon root section and there is clearance between the fuse side and the ball stud on the back side.