Dell Precision 7920 Owner's Manual page 87

Figure 30. Pull out the intermediate rail
Table 15. Rail component
Rail component
1 Intermediate rail
2 Inner rail
3. Attach the inner rails to the sides of the system by aligning the J-slots on the rail with the standoffs on the system and
sliding forward on the system until they lock into place.
Disassembly and reassembly 87