We found an A1286 lying against a garbage can in Manhattan on New Year's Eve 2014. the battery bulged so much, it broke the trackpad. We were able to extract it without removing the logic board. We saw two sets of four screws:
https://www.facebook.com/photo.php?fbid=635731826484326&l=bec343b611
Screws 1 and 4 (silver in color) anchored the bracket to the trackpad.
Screws 2 and 3 (darker in color) anchored the bracket to the upper case.
Picture of removed items:
https://www.facebook.com/photo.php?fbid=635731719817670&l=26a4ae3c26
Pictures courtesy of the Fixers Collective Facebook page.