Krypt Towers' rotating gas swing arm wakeboard rack mount. This rotating mount is probably one of the most popular tower accessories this season.. This gas shock operated swing arm will slowly rotate a wakeboard rack 90 degrees into the boat for easier access to wakeboards, surfboards, or kneeboards. Our gas swing arm can be added to any of our racks, and can be added to a number of our competitors wakeboard racks (please contact email us to see if this swing arm will work on your rack)