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I do the same thing as FWW with the redfin swimmers, but instead of measuring how much water I put in, I fill them with water untill they sit nose up in the water. Easiest to do this in a full sink, once you burn a hole in it hold it underwater and tap it against the side of the sink-u can see air bubbles coming out-and fill it till it sits how u want. I always throw a dab of glue over the hole after I melt it shut.
chris
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