HP Netserver L Server series - Manual (Page 85)

Chapter 8 Rack Mounting the HP Netserver (4-Post)
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A tension spring allows the outer-rails to compress during installation. The
outer-rails are held in place at of the front of the rack by a flat spring tab at
the rear face of the front columns. See Figures 8-2 and 8-5.
6. Repeat Steps 3 through 5 for the outer-rail on the right front and rear columns.
7. If you need to release the outer-rail assembly once it is installed into the rack,
do the following:
a. Place your finger inside the rail at the point shown by the arrow to release
the spring tab. See Figure 8-5.
b. Press in on the spring tab and pull the outer-rail assembly toward you at
the front of the rack. See Figure 8-5.
View Rotated 90 Degrees CCW
Spring Tab
Figure 8-5. Releasing the Outer-Rail Assembly