Dell PowerEdge Rack Enclosure 4020S - Manual (Page 9)

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Figure 6: Leveling Feet Deployment
Installing rack level stabilizers should be done next. The 4220 rack comes with a set of brackets in the rack that are
used to provide stability when equipment is being loaded, unloaded, or serviced in the rack.
Reach into the rack, grab a stabilizer bracket firmly with both hands, and pull straight up. Once the stabilizer has
been removed, use pliers to push the plastic fastener through the hole in the stabilizer and discard these plastic
pieces. See Figure 7.
Figure 7: Stabilizer Plastic Fastener Removal