Cisco 1120 Hardware Installation page 39

Figure 3 Align the Bracket Mounting Holes (2) over the Router Bracket Connectors (3)
1
5. Replace the screws you removed in Step 2 to secure the mounting bracket to the chassis.
6. Evenly hand-tighten the screws (Item 1 in
2
3
Figure 4 on page
39
40), then tighten with the Phillips #2 screwdriver.