Quote:
Originally Posted by lolito_fr
So the insert is reducing the effective width of the channels, to increase water velocity?
Hope it's not steel though 
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Actually it closes up the channels completely, only leaving the space between the bottom of the steel thingy and the copper baseplate for the water to flow through. Essentially it is making square tube structures deep inside the baseplate to keep the water velocity high where it needs to be, on the copper as close to the core as possible.