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Bigben2k: I'm not sure what kind of adhesive I'd use for the copper to plastic region.
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Well, you can just use four blocks of copper instead. The top block is mostly for deeper threading. Without it, the third block is harder to make. There is also plenty of space for drilling screw holes - so you don't have to glue or solder. (With a Dremel you could make small groves for o-rings.)