The Wedge Lok mounts to the PCB either by screws or rivets, with one Wedge Lok on the top and one on the bottom of the PCB. The PCB, with the two Wedge Loks attached, is then slid into the cold wall channels in the conduction cooled enclosure. Once in place, Wedge Lok is actuated either by screw or lever thereby clamping the PCB firmly to the cold wall to facilitate board retention and thermal transfer.