One rod in my power top linkage is a bit loose... it rattles around when the top is up and is very annoying. I have found the joint that is loose... there is a bolt at that point. Can this bolt simply be tightened, or must the bolt come out and a shim washer be installed, or? How does this work? It appears that the bolt is threaded into the rod itself, no nut. It would be nice if it could simply be tightened, but I don't plan to touch it until I know the deal. Thanks