You are so right about making sure to put back the two metal rings when you screw back the two (red) 10.3mm screws. I missed putting back one of the rings and read your comment after I had installed the drive and closed the macbook. Everything was working fine, but I went back to open it an leave it just as it was, with both metal (one with a plastic/cloth material around it) plates/rings attached properly. So it is very important to make sure you put those two 10.3 mm screws back with the plates/rings that they hold, exactly as they were before you put it apart.
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