I'm trying to do the left and right aileron assembly at the same time, we'll see how that goes. I began the assembly by pulling off the 9 year old blue vinyl, did I mention it's boring to do this, but necessary. There, I vented off and feel better. Deburring the spar and leading edge skin came next. Then I clecoed the nose ribs and doubler to the spar. Helpful hint. Be sure to cleco the parts from the rear of the spar as you have to take the spar and leading edge skin off and on a few times. With that done I inserted the stainless steel counterweight tubes, which were perfectly cut by Van's. Match drilled the nose ribs to the counterweight thru the leading edge skin, removed the spar, then the bottom holes in the nose ribs to the counterweight were drilled. Then the upper rib holes were marked for drilling. I took the counterweights to the drill press and stepped up drilling the holes to final #27 size. Trust me, it helps to carefully mark all the holes in the counterweights so you drill the correct ones. Also mark which nose rib goes to which set of holes. No need to ask me why I recommend that. I deburred the steel tube holes and called it a day.