Disconnect your linkage from the ailerons. Use your transmitter to center the servo with the aileron trim at the center point.

Use a small clamp and a straight, flat piece of wood that is about 12 inches long x a few inches wide, and about a quarter inch thick. Carefully clamp the wood to the bottom of the wing across from LE to TE so that the aileron rests on this piece of wood and lays flat. Hold it there with a clothes pin or a soft clamp. I use small clamps that I bought from Ace Hardware. They call them "Quick Clamp".

With the aileron aligned with the bottom of the wing and clamped in place, hook up the linkage so that there is no bind. Obviously, do this on both sides. It's quick and easy, and will get you in the ball park to maiden the aircraft. Once you fly and get the trim right, adjust your ailerons so that they are in the post flight position with the transmitter stick and trim centered.

CGr.