Lenovo ThinkStation P7 Manual page 10

7. Reinstall the heatsink on top of the M.2 drive within the carrier by inserting
the feet on one side of the heat sink into the openings of two of the tabs on
one side of the carrier. Then press down on the other side of the heat sink
until the feet engage the tabs on the heatsink.
8. Insert the M.2 carrier back into the onboard M.2 slot at a slight angle and
press the end down into the slot.
Caution: Be careful not to use excessive force as this risks breaking the M.2
slot.
9. Rotate the red latch clockwise to the locked position, securing the M.2
carrier into the system.
10