Remove the following screws securing the logic board to the case:

One 2.5 mm Phillips screw near the vibrator motor

One 2.4 mm Phillips screw

One 3.6 mm standoff along the side of the logic board nearest the battery opening.

Use a standoff driver bit and driver handle to remove the single 3.6 mm standoff screw.

In a pinch, a small flathead screwdriver will do the job—but use extra caution to ensure it doesn't slip and damage surrounding components.