Nintendo Light Switch

Step 5 Reassemble and Enjoy:)

The final step is to place your switch hardware in the bottom half of the NES remote and align their buttons with the the top half (i.e. A, B, Direction). Use square doweling rods to hold the switch hardware in place. Reassemble the remote and you should be done. It is a tricky business getting it all back together, so you may have to reopen the controller to make sure everything is aligned properly.

http://www.youtube.com/watch?v=0SifRm_Ju8E