NEC EXPRESS 5800 User Manual page 264

7-26 Upgrading Your System
The wire clip is already installed on the heat sink at purchase. If it comes off, install it
according to the figure below.
NOTE: Ensure that the wire clip Make sure of the orientation of the wire
clip.
8. Engage the wire clip with the socket.
The bracket-attached side must be engaged with the rear of the socket.
Bracket attached to
the wire clip
Groove in the heat sink