Basically, there are three essential tools: duct tape, WD40 and a hammer. If something is moving and it shouldn't be moving, duct tape it. If something isn't moving and it should be moving, use WD40. If it still doesn't move after using WD40, hit it with the hammer. If it breaks, tape it back together with the duct tape.
WD40 definitely has a lot of uses, but if a wheelchair athlete uses it, I think it should be declared a performance enhancing substance.