I just got a 79 Cutlass Cruiser. The roof rack is in pretty good shape but the screws that hold the legs of the roof rack to the roof are all loose. I tried to tighten them but they seem stripped or something. Do I have to take the headliner out and weld in some nuts on the bottom of the roof or is there a better way? My headliner is in decent shape so I am reluctant to remove it.