Just cleaned my keyboard

Well, I finally took apart my mac pro keyboard and cleaned out all the dust and dead skin that's accumulated over the years.
Wasn't too hard.
The thing is though, the light under my numlock key won't come on now.
The light under the caps lock key works but I'm a little mystified why the num lock key light won't come on. The functionality seems fine though.
Nice to look down on my keys and not be a bit disgusted.
Now, that damn Apple Pro Mouse. That's another issue.
How the hec do you take it apart?