Lenovo ThinkStation P520 Hardware Maintenance Manual page 200

b. Install the two screws to secure the plastic clip on the rear of the new slim optical drive.
Figure 165. Installing the plastic clip to the slim optical drive
c. Slide the new slim optical drive with the plastic clip into the flex module until the slim optical drive
snaps into position.
Figure 166. Installing the slim optical drive in the flex module
7. Position the flex module cover on the flex module. Ensure that the rail guides on the bottom of the flex
module cover engage the rails on the flex module. Then, push the cover to the front of the flex module
until it snaps into position.
Figure 167. Reinstalling the flex module cover
8. Install the flex module into the flex bay. See "Device in the flex bay" on page 106.
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P520 Hardware Maintenance Manual