fluid cooled electrical assembly that includes a metal box having a bottom wall side walls and a top wall a set of straight edged pins each smaller than 3 mm across in widest dimension extend down from the top wall and up from the bottom wall also electrical components are mounted on top of the top wall and on bottom of the bottom wall application_number US 201213357783 A description referring to fig1 in a preferred embodiment the construction of a liquid cooled assembly includes a work piece 10 having an inflow port 12 and inflow channel 14 and an outflow channel 16 and outflow port 18 in the finished assembly to travel from channel 14 to channel 18 fluid must flow through one of three flow cavities 20 each cavity has a pair of shelves 22 defined on either side cavities are separated by ribs 24 referring to fig2 a lid 40 for work piece 10 includes a planar portion 42 which supports a number of downwardly extending pins 44 in one preferred embodiment these pins are formed by sawing into a work piece which begins as a solid blank of an aluminum alloy in one embodiment this sawing is done.