Has anyone ever messed with a logitech precision gamepad?

A friend and I are trying to mod an arcade stick we made for the Playstation. We’re replacing the playstation controller board with a logitech precision gamepad board, I was wondering if any of you ever messed with/modded with that controller before. The problem we’re having now is finding the grounds, we found one, but apparently it needs two, can anyone help?

I made a wireless sanwa stick with the cordless logitech precision and it works great. There is no noticible lag at all with that particular stick.

What I did was solder ALL the points. I connected all the stick grounds together to the one sanwa stick ground and I connected all the grounds for each button to the corresponding button.

Ahh, thanks alot man, help is greatly appreciated :o