I am building a DH Gypsy Moth biplane from an old kit and am wondering how much travel up and down I should allow. The aileron is 2" x 14" and is hinged nearer the top of the wing/aileron joint as per drawing. The thickness there is 7/8" and I have sanded off some of the lower portion to allow more than the 5/16 or so that was available. How much more should I have? Doc