the copper cap kann be a very good block if you make some changes to the basic design.
Try a dremel or something like that an make the base a little rough. The base shouldn't be much thicker then 2mm. you can solder a smaller copper cap on the middle inlet an place some jet holes in it and direct it with only 2-3mm distance onto the baseplate.
That can make a perfect jetimpigment cooler which can rock some commercial blocks out there.
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