The engagement bar 626 is coupled to the cold plate engagement mechanism 650 (See FIGS. 1 and 9). When the engagement mechanism 650 is actuated, it exerts forces on the engagement bar 626 which are translated by the support arms 622 and the hinge 623 into a torque that cases rotation of the pivoting support 621 relative to the system board 2 (see FIGS. 3A-4C, 6A-6B, and 11A-11B). In other words, the engagement bar 626 is what the engagement mechanism 650 pushes and pulls upon to cause the pivoting support 621 to rotate. The engagement bar 626 also supports those of the support arms 622 (if any) that are not connected to the hinge 623.