I would make one further sugestion for wing bolts I have started using 10/24 nylon bolts and have been completly successful I have them on a astro hog and hog bipe as well as several other designs that are not so well known Being somwhat smaller they will shear a little quicker than 1/4/20 and cause less damage while being adaquate for the most violent of manuvers. If they will stand up to my son's flying they will stand anything.