Rack Installation Guide 152 Push the mounting rail forward until the mounting hooks enter theirsquare holes, and then push down on the mounting-bracket flange untilthe mounting hooks seat and the push button pops out and clicks(see Figure 1-5).3 At the back of the cabinet, pull back on the mounting-bracket flange untilthe mounting hooks enter their square holes, and then push down on theflange until the mounting hooks seat and the push button pops out andclicks.4 Repeat step 1 through step 3 for the mounting rail on the other side ofthe rack.NOTE: Ensure that the mounting rails are mounted at the same verticalposition on both sides of the rack.Installing the VersaRails Mounting RailsNOTE: Ensure that the rotating mounting brackets on the slide assemblies arein the VersaRail configuration. See Figure 1-6.1 At the front of the rack cabinet, position one of the mounting railsso that its mounting-bracket flange fits between the marks you placed(or numbered locations) on the vertical rails in "Marking the Rack"on page 10 (see Figure 1-6).The three holes on the front of the mounting-bracket flange should alignwith the holes between the marks you made on the front vertical rail.2 Install two 10-32 x 0.5-inch flange-head Phillips screws in the upper andlower holes in the mounting-bracket flange to secure the mounting railto the front vertical rail.3 At the back of the cabinet, pull back on the mounting-bracket flange untilthe mounting holes align with their respective holes on the back verticalrail.4 Install two 10-32 x 0.5-inch flange-head Phillips screws in the upper andlower holes in the mounting-bracket flange to secure the mounting railto the back vertical rail.5 Repeat step 1 through step 4 for the mounting rail on the other sideof the rack.NOTE: Ensure that the mounting rails are mounted at the same positionon the vertical rails on each side of the rack.