New rails finally arrived today (on back order and then misplaced at warehouse!!). The old bolts were sprayed several times with penetrating oil while waiting for the shipment to arrive. The bolts would not move with a screw driver or wrench. Then I used Vice Grips, the bolts still did not move but now I have a crack in the housing, one of the four bolt attachment points. Is this cast aluminum? Can it be repaired? The grill works fine and is in pretty good shape other wise. Any help appreciated.