Use this guide to replace your optical drive.
Flip the ThinkPad upside down with the bottom facing you.
Slide the latch on the underside of the ThinkPad to the right into the unlock position.
While holding the latch in the unlock position, lift the battery out with your other hand.
Locate the 4.8mm Phillips #0 screw on the far left of the ThinkPad, closest to the edge and above the battery, and unscrew it with a Phillips #0 screwdriver.
On the side of the ThinkPad, locate a lock next to the optical drive. Use your fingernail to slide the lock to the right.
Once it is unlocked, a small tab will pop out. Pull on the tab with your fingers.
The optical drive will easily slide out. Remove the optical drive.