I have a 1983 Cobalt, which has the old school type of tow ring on the back for skiing, tubing, etc. The ring is attached to a large lag bolt that connects a steel mounting frame in the back of engine compartment. The nut that keeps the bolt tight to the mounting plate has come loose. This causes a "thunk" sound when pulling a skier/tuber because the bolt has about an inch of play in it. I can get to the nut, but is NOT easy. Does anyone have a similar set up and experience tightening the nut on the tow ring bolt? I can loosen the nut, but I cannot seem to get it beyond a certain point on the threads when tightening it, which leaves the play. I'd like to be able to tighten the nut so that it contacts the mounting plate. Any help, or alternative ideas would be appreciated.