Prepare the aileron hard points. Sharpen a piece of 1/2" brass tube for a drill. Chuck it up in a drill press and tighten the chuck by hand. Try to align the brass tube so it doesn't "wobble" while drilling. A little wobble is ok. It is very difficult to get it perfect. Draw a mark where to drill, and drill. Go slowly to keep from damaging the skin on the bottom side. It is important to keep the wing in the original shuck to maintain a square hole.

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