My Razer Atrox Connection cable got broken, how do I fix it?

Hi everyone.
The connection cable on my arcade stick (Razer atrox for xbox 360) got broken. one of the pins inside ended up back inside its socket. I’m quite sure I can fix it if I can open the blasted thing, but I found no ways to open it. can anybody help?

here are some pictures of the part (the broken one is the pin on the middle on the right)