[Latitude 28]

My tabs and steel bar was not loos just sagged.  IMO the sheet metal screws were not big enough in diameter to handle the load hence adding a few of the structural screws in addition to replacing the rest of the sheet metal screws.  Of coarse the screws are installed after the sag is corrected.  Those type screws, with a clearance hole drilled and counter sunk in the steel bar.  The screws will drill and thread themselves into the aluminum with a solid bite.