I'd just like to mention that if anyone is having stability problems with xctrl, use the psxpad drivers (google it) they are by far more stable for me.
As for a few posts above, I would insulate each of those connections with some electrical tape, and the ground is that tin-foil like stuff that surrounds the wires on each end, basically take a short piece of wire, and solder it to each end of it.
If anyone wants to see how I did mine, I oppened the end case on the breakaway cable, then unsoldered the factory end, and put my usb in. I put the factory case back on, and hot glued the usb male into place. It looks almost stock.