The Bottom Case Skirt Plate, secures the lower half of the rubber Air Cushion (Skirt) to the inner part of the upper hull.
Rubber Skirt Replacement: To remove and replace the rubber skirt on the RANGER, start with removing the five screws that hold the Lower Case Skirt Plate to the RANGER's Upper Hull.
With the plate free, the rubber skirt still holds it to the RANGER. The bottom of the Rubber Skirt has a special thick edge that is made to be held by the 13 little clamps around the Lower Case Skirt Plate that holds it in place. They just slip out with a careful gentle tug.