I was thinking of building one myself. Would an old gym weight work perhaps? Maybe a 20 pounder or something, the plastic kind filled with sand so there would be no worries of rusting over time. And I figure 20lbs in a backpack or something wouldn't be to bad to hike to your diving spot. And it would also save you precious time by not having to find rocks and stuff to put in it. I may steal your inner tube idea though, very clever and simple!
Good luck! -John
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"Life is not measured by the breaths we take, but by the moments that take our breath away"
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