In my case it was the two screws securing the SSD, not the end cap. The end cap was packed in a zipper with many small screws. The screws holding the SSD were very tight and the heads started to peel off. I managed to unscrew them with pliers. After that everything went fine. The connector is an early USB 3 connector. I have them on some older items but haven't attempted to purchase them recently. I was able to use the adapter to transfer my operating system etc to the new drive but it almost stopped working due to the screws.
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