Pimax Crystal Super Installation Instructions
The right and left inserts are marked with an R and L respectively.
To install, roughly align the insert and gently press the whole insert down until it snaps into place.
The correct alignment is achieved by those two pins on the bottom of the insert.
You might have to slightly rotate the insert back and forth until the pins settle into their corresponding holes.
To uninstall, press the nose area outwards to loosen the outer snap-fit and lift the insert off.