I recently purchased a 93 Civic Si. The piece that sits on top of the hatch seems to be loose. I go down the road and when I hit a bump in the road it slaps against the glass. I have tried tightening the 4 studs that are attached to the hatch. They were all really tight. Is there any answer to tighten this up? The person that I bought it from had a roof-rack on it and I think that she rested stuff on the fin. If you guys have any advice I would appreciate it. Oh, one last note. I took it off from the hatch and I noticed that around one of the studs there is a crack. I think that if I weld that up it might help, but I don't believe that it would take up that much slack. Thanks again for your help.