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It's really easy and cheap. Get a couple of feet worth of 1/8 or 3/16 bungee cord from REI ($0.15-0.30 a foot), and a ziptie. Measure to length, a knot at each end (perhaps with a dab of crazy glue on the knot to keep it from unraveling) and ziptie it behind the regulator mouthpiece.
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