HP Surestore 6164 - Switch Reference Manual page 40

If you cannot insert the switch into the rack from the back, you
Note
must remove several pieces of hardware from the sides of the switch at
the front end as described in Steps 7, 8, and 9. If you have adequate
access to insert the switch into the rack from the back, you can skip
these steps.
7. Remove the four #6-32 x ¼-inch flat-head screws that attach each of the
two hinge plates to the left side of the switch at the front end (see
Figure 13). Set the screws and the hinge plates aside for later use.
Figure 13. Removing the Hinge Plates from the Switch
40 HP Surestore FC Switch 6164 Installation and Reference Guide