So one bottom screw didn't catch the thread. These small screws only have 2-3 rounds to catch on, that's really bad. So I bought the small screws from the MacBook Pro which are 3 mm long and replaced the two middle / side screws (left and right) with the longer one. Those fit perfectly and are way better and secure. Its only a way of time if a bad machined thread strips, so longer screws help.
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Have you tried a T4 and some epoxy or other glue? I think with epoxy you can mold a T3 in. I didn't found a source yet. They are 1.2mm width and have a flat head. BTW. I had the same Problem.