HP ProCurve 2650 Install Manual page 28

Installing the Switch 2650
Installation Procedures
2.
Partially install a screw
into the top hole of a
close (0.5-inch) pair on
both sides of the rack
3.
Lower switch with mounting
brackets onto the partially
installed screw
2-12
Partially install a screw (5/8-inch number 12-24) into the top hole of a pair
of holes that are 0.5 inches apart in each rack/cabinet upright as shown
in the illustration below. Ensure that the screws are at the same level in
each upright.
Place the switch in the rack and lower it so the notches in the bottom of
the bracket slide onto the screws, then tighten these screws.