get some old motorcycle inner tubes and cut out the valves you can put them through from one end and the nut that would go on the outside of the rim goes on the out side of the tube, to seal the end's, add silicone sealer at the end fold over and roll up once or twice and clamp with a mole gripp, or make a round bung silicone it in and jubilee clip that
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Mattys the driver,my names carl
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