Keyboard Bagatelle

I was wondering what I could do for the Keyboard Vs Mouse challenge, and I just kind of thought of this. This isn't bagatelle in the strictest sense because the ball is not being hit up the table in order to go down, it is just dropped from the top. This is because I felt that there was not enough room widthways to add a launcher section on the plate. Plus it wouldn't have worked with the shape.

This project only uses parts from a keyboard (apart from the ball, couldn't find one in my keyboard) plus some adhesive material, depending on your preference.

Step 1 Materials

OK, not much needed for this project, just:
A keyboard
A ball to go down the bagatelle - I used the ball from a mouse because it was a convenient size, but it was a bit heavy. (just to be clear, I am on the keyboard side of the contest and only used the mouse because I had one close by)
Hot glue (or any other type of glue you think may work - blutack for a more temporary solution)
Glue gun (if you are using hot glue)
and a screwdriver for opening up the keyboard.