You could always go the aircraft route. Virtually every nut, bolt, and screw on aircraft (military at least) is "safety wired". This only entails drilling a small hole through one of the corners (shoulder) of the nut, running stainless wire through the hole (long enough to have a few inches sticking out each side of the hole), twisting it into a tightly wound "pigtail", pulling it in the tighten (right hand) direction, and securing it to something that moves with the nut (Like a small hole in the strut mounting flange). Guaranteed to hold the nut in place.
If anyone wants to try this, and can't find the stainless wire (about .032" thick), I have plenty, and am willing to send you enough to do both sides. PM if interested.
Old Chief
