+1 for piece of old innertube. You could also use one of the older style 'clamp' mounts,they're interchangable with the newer lights(the mating pieces are identical between the older clamps and newer flexes).
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Brompton S6L/S2E-X/M6L-X/S12 T Line
