Dice that won't roll off the table

To throw the dice, a double action is required. Firs rotate the dice as fast as you can with one sweep of your fingers. Stop them by pushing the stop button.
The outside of the dice has a dark color. A light colored insert makes the dots visible.
The shaft is a 120mm M5 threaded rod. it is attached to the bracket with two nuts. At both sides a dice slides over the shaft and is secured with a self locking nut. Make sure the dice rotate freely. The shaft for the stop button is M3. Good practice: