My first reaction when I first tried to attach this to my 21.5 inch iMac was that this suction cup didn't fit. Well after using it for the past three days at the end of my day I realized that's what it's supposed to do. Just because you don't want dust on your screen and I have to admit it stays there and doesn't move. This is how I put mine on, top left first, then bottom right. After that, the rest glides along like the wind.
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