Dell Force10 S4820T System Getting Started Manual page 23

4 Repeat this procedure for the second rail.
Two-post Center-mount Configuration:
1 Slide the plunger bracket rearward until it clicks into place and secure the
bracket to the front post flange with two user-supplied screws. Refer
to Figure 1-7, item 1.
Figure 1-7. Two-post Center-mount Configuration
2 Slide the back bracket towards the post and secure it to the post flange
with two user-supplied screws. Refer to Figure 1-7, item 2.
3 Repeat this procedure for the second rail.
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Installation