This is what I am currently working on for my part of the Neopong game. I am drilling a hole into the metal and after that tapping it so that the button has the right size hole and threading to go into so that is secure in the tube. This particular button is special! finding the right tapping tool and hole radius has been a challenge.
Drawings of the new component to house the buttons
Finding the best way to place the buttons hasn't been an easy task. Since I am still figuring out dimensions of the button and the right tapping technique for the buttons to end up being housed on both ends of the tube, I've designed a drawing of an aluminum cylinder which will be attached to the ends of the acrylic tube.
OscarB 