H3C Technologies H3C MSR 3600 - Manual (Page 29)

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Figure 23 Marking the positions of cage nuts on the front rack posts
2. Insert one edge of a cage nut into the square hole on a rack post. Use a flat-blade screwdriver to
compress the other edge of the cage nut, and then push the cage nut fully into the hole.
3. Repeat step 2 to install other cage nuts to all the marked positions on the rack posts.
Figure 24 Installing cage nuts
4. Attach the front mounting brackets to the chassis and fasten the screws.