H3C Technologies H3C MSR 800 - Manual (Page 16)

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Figure 6 Marking installation holes for cage nuts
2. Install cage nuts on rack posts, as shown in Figure 7 .
a. Insert one ear of a cage nut into the marked installation hole.
b. Use a flathead screwdriver to push another ear into the same hole.
Figure 7 Installing cage nuts
3. Install mounting brackets on both sides of the router, as shown in Figure 8 .