Use a strip of neoprene, cut holes using hold puncher that is slightly smaller than the pellet head size. Then velcro the strip on to your air tube, position it to the left if you are a right hander. Is your air tube metal? Then you can use some small magnet fasten to your neoprene strip and just place it on the tube. You can also use a small strip of metal and glue the underside of the Neoprene then add magnets.
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