OWC Mercury Installation Instructions Manual page 16

Turn the original drive on it's back and point the slot toward you as shown in this picture.
Using a small thin straight screwdriver, or a paperclip, press gently on these two release
tabs circled in this picture. You will find two more tabs on the bottom side of the drive
(pictured below), and also one on the side. Once you release the tabs, you will see the
other capture points and the removal is simple. Be patient, and do not break the tabs.
Remove and place the feed slot onto the new drive in the same way you removed it from
the old drive, starting with the side tab and hinging the slot onto the drive mechanism,
locking it into place.
OWC Mercury Optical Drives Installation Manual Page #16