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I made the tab out of .063 aluminum 3" X 14". I placed it a little in from the tip so that if it doesn't have enough effect in flight, I can put a larger one in it's place. To get enough room, I drilled out 3 rivets from the nose skin and put nut-plates in their place. Putting a nut-plate in the center bottom was a mistake. It interfered with the rod.I see now that the Servo could have been mounted a few mm over so that the rod and nut-plate would clear.