Hello There
Not sure about how the mounting will be for the crystall tb.... but basically, when I ran into a simualar problem... I had to make my own Mounting plate.
Grab a small sheet of metal at the hardware store... should be arround 2mm thick. Cut by clamping to scrap wood and using a good jigsaw blade... or better yet, use a table-saw with a metal cutting blade.
Draw a circle in the middle of the plate, that matches the balls size at the approiate height. To cut the hole, first drill a small hole using a small drill bit. Then grab a larger bit, and re-drill... repeat untill you can fit a jig blade in the hole. If you had a nice metal hole saw, that would help. Ive killed a few drill bits by trying to cut into thick steel... and found that by using progressively bigger bits, it keeps the bits from getting damaged.
Use the jig to cut the hole in the metal. Smooth and round the the edge with one of those drill bit sanding bits. (cylendrical stonelike material on a bit) Sand with corse and medium sandpaper, and paint : )
Opps.... you will also need to drill like 8 holes. Four arround the edges to secure the plate to the control panel... and 4 alternating holes to secure the trackball to the plate.
You could probably make a plate out of thick plastic as well. It would be a lot eaiser to cut, shape and drill.
Good Luck
Steve