http://www.engadget.com/2011/12/18/circle-pad-pro-cracked-open-plenty-of-room-to-put-your-feet-up/
http://www.ifixit.com/Guide/Replacing+Nintendo+3DS+Circle+Pad/6064/1
http://www.youtube.com/watch?v=IJv2SBByoj0

http://zombiesatemygames.com/wp-content/uploads/2013/04/3ds_xl_circle_pad_pro-1.jpg