
I watched the installation video in the listing and followed the instructions, folded the cover in thirds leaving only the middle third open, centered it over the window icon and then tore off both remaining thirds. I centered and squared it as much as I could with a middle icon (?) before gluing it on. When the outer 3's were in place I saw that they had moved about 1-2mm. The fraction of a millimeter I couldn't make out in the center multiplied as I moved to the edges. The camera window and associated sensors are now only 98% open. The camera lens is open. I gave it four stars because it's a good 3M decal and it looks great. I installed the bottom with a slight (maybe 1/2mm) bump and the keyboard cover and trackpad cover worked 99.5%. It's entirely possible to get it 100% straight and aligned, but baby it's not easy.

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