A piece of stainless steel tubing is inserted as a counter weight in the leading edge of the ailerons. You have to match drill multiple holes to the tubing. I tried hand drilling a couple of these holes but the stainless is really tough and it is difficult to keep the bit from wandering off center. The result is an out of round hole and an enlargement of the hole in the aluminum skin. I built a jig to hold the aileron assembly so the holes would be vertically aligned. I then drilled the holes using my drill press. The drill press runs at lower rpms and I used a little cutting oil. This ended up being a much better method to drill the holes.
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