Nasty broken controller so I rough housed it to open it a bit but used the diagram I saw online.
#1.. no clip at the very bottom as I saw in diagram.
#2.. I did break the bottom 2 but simply working my way to the top by pushing plastic over the buttons, the top came off undamaged.
Not sure what to do about bottom 2 right now.
I have 1 more to try .. my other 2 are none functional at all but look mint.