HP Netserver L Server series - Manual (Page 71)

Chapter 7 Rack Mounting the HP Netserver (4-Post)
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3. Attach the Cable Management Arm to the HP Netserver:
a. Insert the thumbscrew on the inner flange of the Cable Management
Arm into the hole in the chassis slide mount.
b. Tighten the thumbscrew to secure the Cable Management Arm. See
Figure 7-8.
4. Extend the HP Netserver out of the rack to ensure the Cable Management
Arm moves with the chassis without binding.
5. Dress the cables in the Cable Management Arm, and then slide the HP
Netserver into the rack to verify that the cables do not bind in the tray.