When I open the numpad keyboard there is a tiny PCB with 11 connections. The buttons was connected to different once of them but not in any logial order. I think I can use it to send any key to the computer not just numpad keys
My connection layout
http://pici.se/thumbs/t_yfcQPBLuc.gif
X is wire 1 and Y is wire 2 for that button. So to get a numpad button 1 I had to connect 2 wires to pin 4 and 8. And as you can see buttons 1-3 all use pin 4 of the Numpad PCB. That is why I made had my own Lab circuit board as an extension of the pins to connect the wires.
I know there isn't anything like this to buy thats why I made one. :D
Verry short guide
I got lots of stuff and then I put the pieces together :p