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With the tub held in place with locking pliers (outside of car) and self-tapping screws (inside of car), the tub was secured to the support flange with spot-welds spaced every 2 inches. Since the tub isn't a critical load-bearing member, spot-welds suffice. The procedure was repeated inside the car, with spot-welds replacing the sheetmetal screws one at a time. Finally, the welds were ground flat.