MacBook Air 2017 microphone replacement, microphone aligment, how?

Here’s the needed replacement guide MacBook Air 13" Early 2015 Dual Microphone Replacement.

You might find the hole has been plugged with some junk. After taking the mic board off (being careful not to damage it) using a can of can’ed air with a snorkel tube attached try blowing the holes out. spraying from the inside pushing the debris out the outside surface. A cotton swab wet with isopropyl alcohol can also be used to get anything caked on.

Hint: Before taking the part out scribe a set of lines into the case so you can index the part when you put it back or put in the replacement