I am going to try and make my own Hex Discs for my cx-10 joysticks. I can measure the inside of the top with calipers and use some radius gauges to get close to the original dimensions, but I am struggling with how to come up with the thickness of the Discs. If someone would be so kind as to share the dimensions of the original Hex discs I would greatly appreciate it. I am planning on making them out of aluminum and then getting them anodized. After anodizing I am going to do the Atari lettering. The current ebay prices are $100 per disc, so I think its worth my time. Thanks again for any help!