Next out: the midframe that housed the motherboard. Clinging to its side we find a small ribbon cable that plays host to the headset button.

There are many Texas Instruments TLV70233 300 mA / 3.3 V LDO Regulators on the flex cable around the midframe.

A closer look at the midframe reveals a slot for the little black nub on the back of the left display panel.

This slot allows the nub to peek through and slide along that white Teflon strip, activating a linear potentiometer, used to track IPD position as you adjust the displays.

Ready to go deeper, we remove the twin lens-and-display assemblies from their housing and peel off the rubber light-gasket from around the lenses.