Several of the bolts on the fixtures in my high school auditorium have rusted into place, or were just tightened too much at one point. I have tried to loosen them with sheer physical leverage—a 2 foot long rachet, however the bolt just won't move. What kind of loosening lubricant or device would be safe and would work? I was thinking of some kind of oil, but oil is flammable, and I doubt that anyone would like a fixture catching on fire during a performance! The lights are Strand LekoLites, and they can only be reached from a 24 foot high extension ladder. Thanks!