A pontoon boat's cover system has includes a rib-cage structure to support a fabric cover formed by hollow poles flexed into low arches and anchored into opposite brackets on the left and right top (hand or side) rails of the pontoon boat. Each bracket has a zig-zag pin and a U-base. Each zig-zag link originates as a bottom axle changing into a central column changing into a cantilevered stake. Each U-based cups a top rail of the boat with a bottom axle inserted through holes in the U-base across and over the top rail it cups. The central column seats in a saddle of one of the U-base's arms to stabilize the zig-zag pin the front to back direction. A locking collar slides over the saddle with the central column seated therein in order to retain the zig-zag pin from unseating from the saddle.