Lenovo ThinkStation P920 Hardware Maintenance Manual page 200

c. Flex the four clips on the sides of the retaining bracket to remove the front Thunderbolt I/O adapter
from the bracket.
Figure 163. Removing the front Thunderbolt I/O adapter from the retaining bracket
6. To install a front Thunderbolt I/O adapter, do the following:
a. If necessary, remove the dummy bezel. Then, install the bezel in the front Thunderbolt adapter kit to
the flex module.
Figure 164. 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 165. 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.
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P920 Hardware Maintenance Manual