Thats a good idea (thread and CA), but if the screws come loose, your not going to have a working elevator anyway. Those collar screws are no more likely to come loose, than any of the easy connectors at all the servo's. Crank em down good and stop worrying. I hear so many people out here overengineering stuff. If your really worried about it, pull the lower wing after a week and check to see if you can tighten em up any. I've checked mine twice so far, and couldn't get em to go any tighter.