Apple MacBook Pro (13-inch, Late 2011) - Manual (Page 43)

43 Chapter 3 Boost Your MacBook Pro
10 Replace the bottom case. Replace and tighten the ten screws you removed in step 2 in
their proper locations, making sure to insert the shorter screws at the angles shown in
the illustration.
Short
Long
For information about installing Mac OS X and bundled applications, see “Repairing,
Restoring, or Reinstalling Mac OS X Software” on page 54.