Cabletron Systems 7C04 Workgroup - Manual (Page 14)

Installation
2-3
7. Align the two round holes of the left mounting bracket with the
holes (from which you removed the screws) on the left side of
the chassis.
8. Insert the screws that you removed in step 6 into the holes on
the bracket and chassis. Tighten the screws until the mounting
bracket is securely attached to the chassis.
Figure 2-1. Attaching the Right Mounting Bracket to the 7C04 Chassis
B R