I don't know, I guess I can visualize the force the aileron is receiving when doing a snap roll, and see those screws together with the horn, being ripped out in mid flight. I'll try to find longer bolt through screws and if I cant find them I'll do it with the wood screws. Another question: When aligning the horizontal stab for gluing, the instructions state to stand 3 metes away from the plane with the wing bolted on to see if there is a horizontal mis alignment with the wing, if any sand the slots in the fuse to get the right alignment. This is only a visual way to check it but do you know of a way to align it without relying on my eyesight. What if I'm wrong? What if I have worked on the computer all day and my eyes are tired. I don't want to rely on my eyesight or my judgment for a plane that is designed to do PRECISION aerobatics. Any suggestions?