The screws packed with the tray trolleys were too big. And the instruction shows how to put 7 screws, 2 for the hard drive in the converter and 5 for the converter in the caddy. There were only 4 screws in each package and none of them were used. I had screws from the original 2.5" case, but there were only 4, so I didn't have enough screws to fully attach the drives to the case.
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