RE: Aileron Servo and Covering question
The above suggestions for the floss and weighted string are good for when you have already covered the wing and therefore there hadn't been a method planned ahead of time. However, since you are planning ahead of time I suggest a rolled piece of paper the proper length and then inserted through the lightening holes before covering. One end terminates at the aileron pocket and the other runs to the center opening. I have used regular lined paper, craft paper, etc. and after making it into a tube and inserting into the rib's holes I normally put some CyA at each junction of tube and rib.