My trapper 500 has a tiller that goes to a rudder boss at the rear of the cockpit. It rests on a small support that screws into the boss with a single screw. The screw works loose, the support sags and the tiller droops so badly the autopilot jumps off. Cures so far tried are sikaflex hoping that an adhesive bond might help followed by medium strength loctite. Both failed. I have not tried permanent loctite as one day I might have to remove it. Is permanent loctite really permanent? Any other suggestions? I am about to resort to keeping a screwdriver handy and tightening the screw every time we sail.