make it a 2 piece design. Get 2 blocks of identical copper, take a saw, start cutting lines. Take the other block, mill it out to "cup" over your freashly sawed fins. The sawing motion will make the fins super rough on the sides giving you turbulance and more contact area. This block looks like the Sooper Pelt Block 'O Doom!
My 2 cents
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MeltMan
Lurker Supreme!
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