HP 2103R-CSDI - Manual (Page 39)

Installing the ONcore Edge Router Module 2-15
4 Close the ejectors (Figure 2-6).
Figure 2-6 Opened and Closed Module Ejectors
5 Using your fingers, tighten the two spring-loaded screws on the front of the
Edge Router module faceplate (do not overtighten).
Opened
ejector Closed
ejector