Once you align the middle cover on top of the ControlTalk board, you are almost done. Simply put the last piece of top of it and press gently to hear the light clip sound. That is it. Careful alignment gives the same feel and look of your ControlTalk as was before. Nobody will notice that you operated this little thing for repair purpose.
Once you place the top tab on, it should look comfortably aligned to the base. A little wider opening is an error or the setup is not 100% well done. This is critical. But it can be fixed. Open the first cover on top, and then see if its tinny tabs of the base are standing properly. If not, you have to try to straighten it. You can use crazy glue kind of stuff to affix it back. But do not use such material directly to the shell. Only the tabs should hold and align the exterior.
If you have Monster iBeats ControlTalk headphones defective that doesn't respond the press of the talk or mute/play button, you have just solved this issue. Enjoy.