The issue before last of Sport Aviation has an article on making a tool to help get the washer and nut on a bolt through Adel Clamps. It is just a V cut in the end of an old hack saw blade. Once you get the clamp(s) squeezed down using pliers or vice-grips, you can slide the hack saw blade in so it engages the first exposed bolt thread above the Adel clamp. That will hold the clamp in it squeezed down position while you get the pliers out of the way to put the washer and nut on. Sure wish I would have known about this 5 or 6 years ago!
