I built mine with 3 bags of concrete, which I poured into a duck tape reinforced cardboard box. Mine is in 25' of water, and I didn't want have to do it twice, so I sunk a stainless eye bolt into the middle of it. I built the whole thing on my raft at the shore then floated it out to its final location and pushed it overboard with chain attached. I have a 24' boat at a very windy location and it has never moved as far as I can tell.
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La vita è buona su Isola Gatto Nero
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