Install and Secure the QXS-412/424 Chassis
QX and QXS 12- and 24-Drive Rackmount Install Guide 16
 10.  Tighten the screws that you loosely attached in Step 3.
Figure 15: Tightening rail screws
 11.  Repeat steps 1, 2, and 3 for the other side of the chassis.
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Install and Secure the QXS-412/424 Chassis
 1.  Carefully lift/align the chassis and slide it into the rack. Ensure that the chassis is level.
Caution:  
 l Rails might bend if the chassis is not level when inserted. 
 l Replace the rail if it becomes deformed as a result of inserting the chassis in an unlevel position 
during installation.