The project instructions detail how to modify the serial version of the hand controller, which is more common on the smaller mounts like that found on my Nexstar 6SE. However, I also have an AVX mount for my other telescope that I'd like modified as well, but its hand controller is USB based.

Turns out it's even easier to modify than the serial version because the pins on the USB chip are significantly larger! Please note that the USB chip is upside down when compared to the serial adapter chip of the other HC (pin 1 is to the lower-right, instead of the upper-left).