Secure the PCB to the upper case half using the original 5.38 mm #1 Phillips screw and the included washer.

Do not over-tighten the screw or you will break the screw hole.

Be sure to orient the PCB so that the voltage regulator points towards where the grey power inlet used to be.

Peel the white back off the thermal pad, being careful not to accidentally peel the thermal pad off of the heat sink.

Set the heat sink onto the voltage regulator so that their lower left corners, as oriented in the third picture, are aligned. Press the heat sink firmly onto the voltage regulator to ensure that it will stick.