HP LH 3r - Manual (Page 16)

Chapter 3 Installation
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3. Using two people, lift the NetServer using the handles on each side. Move
the NetServer in between the extended slide members and position it so
that the handles are resting on the slide members (see Figure 3-5 and
Figure 3-6).
Figure 3-5. Lifting the Server Onto the Slide Members
4. Line up the mounting holes in the slide members with the holes in the
NetServer chassis, insert the three screws on each side, and tighten them
(see Figure 3-6).