Lenovo ThinkCentre M73 10DL User Manual page 56

7. Slide the new optical drive into the optical drive box until it snaps into position.
Figure 21. Installing the optical drive into the optical drive box
8. Install the screw that secures the optical drive in the optical drive box.
Figure 22. Installing the screw that secures the optical drive
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ThinkCentre M73 User Guide