A building tip I picked up somewhere that makes dealing with Adel clamps less annoying. Using pliers (or vice grips if you don't have a helping hand) to hold the clamp together put a small piece of safety wire around the base of the clamp. This tend to make the clamp loose enough to move yet easy to assemble. I recently swapped out the autopilot servos and they are mounted with Adel clamps which where a huge PITA. I put safety wire on the clamps before disassembling them and putting the new servos in was a snap.