@ChristianG Great Question. The truth is there is no good way to ground this unit, and I am not sure I would try. It kind of blows my mind that you were even able to blow the unit via a static shock. I mean yes I know it is possible. All of my teachers 20+ years ago warned me about it. That being said I have been in the low voltage industry all my adult life, and I have never seen anyone in real live blow a unit via static. I did not design the joystick board and I would have to look at it's specs, cut sheets, and wiring diagram to show you how, but you should be able to by grounding the main negative at the board. But do this at your own risk....