One of the newer guys flying at our field has large U - shaped tin straps about 3 or 4 inches wide that go over the leading edge or his main wings. These are attached to a large rope which he fastens around one of the fence posts. There is no way that plane is going to get loose or damage his wings. From what I understand that was a requirement from whatever field he flew from before moving to the States. I think while being laid up this winter I'm going to fashion a set for my plane..... It's still a good idea to have someone hold the plane especially on the first start of the day. I always start at idle and never rev her up using only the restraints. On a few of my smaller planes I have made the mistake of having the wrong plane on the radio also. Shame on me but mistakes happen. Whatever keep yourself safe. Bill