Dell Force10 S4820T System Getting Started Manual page 22

Two-post Flush-mount Configuration:
1 For this configuration, you must remove the castings from the front side of
each ReadyRails assembly. Refer to Figure 1-6, item 1. Use a Torx driver to
remove the two screws from each front flange ear (on the switch side of the
rail) and remove each casting. Retain the castings for future rack
requirements. It is not necessary to remove the rear flange castings.
Figure 1-6. Two-post Flush-mount Configuration
2 Attach one rail to the front post flange with two user-supplied screws.
Refer to Figure 1-6, item 2.
3 Slide the plunger bracket forward against the vertical post and secure the
plunger bracket to the post flange with two user-supplied screws. Refer
to Figure 1-6, item 3.
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Installation