HP Model 743 PC Owner's Manual page 61

NOTE:
Springs
Figure 2-14
c Thread the springs included in the kit into the ejector handles on the PMC ex-
pansion board, and with the springs compressed, slide the labels from the
board computer into the sleeves, as shown in Figure 2-14.
To properly identify the board computer model and manufacturer, we
strongly advise that the original labels from the board computer be placed
into the ejector handle sleeves.
Installing the Springs and Labels
PMC Bridge Adapter and Expansion Adapter
Labels
Accessories Installation
2-23