The suction cup is designed to hold a corner while you align the protective film for installation. However, this is not enough because you have to hold the protective film with your thick fingers in another place. It is this last fact that makes good alignment difficult. On one protector I did a suction cup and toe alignment which resulted in an edge hitting the rim and of course the screen didn't stick to it. When the tread was removed very slowly and evenly, it broke and had to be disposed of. I've attached the second tread with a suction cup and pressed it gently against the rim and I've managed to place the tread better, but there is no gap along the top edge and a noticeable gap along the bottom edge (instead of being even). distributed release around. My two cents: if you're unlucky enough to have a less than satisfactory installation *or* buy a second set to try, try again. SUPPLEMENT: I ordered a second set and with the 2nd small suction cup I was able to easily mount one of the new protectors.
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