Lenovo ThinkStation P520 Hardware Maintenance Manual page 196

Figure 156. Installing the bezel to the flex module
b. Align the four holes in the front Thunderbolt I/O adapter with the corresponding mounting studs on
the bracket. Then, press the card downward until it snaps into position.
Figure 157. Installing the front Thunderbolt I/O adapter into the retaining bracket
c. Hold the clip on the retaining bracket. Then insert the front Thunderbolt I/O adapter and the retaining
bracket into the flex module as shown until they snap into position.
Figure 158. Installing the front Thunderbolt adapter and the retaining bracket into the flex module
188
P520 Hardware Maintenance Manual