Ordered 3 times in total 8 pairs. Without exception, all screws were lost within a few days. At first I thought I just needed a little tight stew. After the first 4 pairs were sold out within a few weeks, I ordered 4 more pairs. If I try to adjust the screws before using them, all I notice is that the screws just get stuck there. There are almost no threads. I applied some blue screw lock. But don't think that this can take long. I now order other brands. I never thought that a product could be of such poor quality.
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