I just finished restoring my 1991 SSP and even though I have tightened all the blots etc, I still have a slight wobble to the structure. I am not sure but I think that it might be the two pieces of tubing on the bottom of the grill with the star nuts so I was thinking of trying to replace them with new ones. I do not think that they were rusted per se, but everything else seems pretty tight. Any suggestions?