Lenovo ThinkStation C20 User Manual page 22

5. Press the two tabs
remove it from the chassis.
Figure 8. Removing the PCI card holder
6. To reinstall the PCI card holder into the chassis, insert the two tabs
in the chassis, and then pivot the PCI card holder downward until the front of the card holder snaps
into position.
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ThinkStation User Guide
1 that secure the PCI card holder 2 inward, and then pivot the card holder to
1 into the corresponding holes