Users write about a tight curtain. This is true. The curtain "out of the box" is very tight. But ! I know a similar construct in a variety of products, for different purposes and in different sizes. This is a "plain bearing" that needs lubrication to operate. Therefore, without looking, I took a viscous silicone grease. He applied it with a toothpick to the grooves in which the curtain slides. The excess was carefully wiped off with a wrung-out alcohol wipe. After that, he put the bumper on the phone. The curtain opens with a little finger with zero resistance! All the best! Bumper is great! Use with pleasure!
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