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After test-fitting the framerail doubler assembly into place, it will be necessary to make a number of fine-tuning adjustments. These include trimming the upper pocket so it fits flush with the exterior floorpan doubler (which is designed as reinforcement to the upper link pocket). Once completed, remove the unit and secure it in a bench vise. With a 9/32-inch drill bit, drill 12 plug-weld holes into the assembly to prepare it for final installation.