Lenovo ThinkServer RD230 - Manual (Page 10)

8. Make sure that the front mounting bracket is flush with the vertical mounting surface and the screw
holes in the front mounting bracket are aligned with the corresponding holes in the rack mounting area.
Then, partially tighten two M5 x 10 screws with washers to hold the front of the outer rail in position.
Figure 11. Tightening the two M5 x 10 screws
10