When installing an NVMe SSD into the enclosure, slot the NVMe into the enclosure by gently pushing it until it clicks. It will be inclined at an angle at first. Rotate it down and fasten it with a knob or a screw which is set at an angle. It should be straightened and locked down. Take care not to over-tighten or break the SSD. Finally, the back of the enclosure can be fitted with screws with care not to over-tighten as this is a common problem with low quality enclosures.