i have to replace the dc jack on a sony vaio nw series notebook.  the part i ordered has 2 black ground wires, but the part inside it has one black ground wire.   they have the same exact part number.  they have a loop at the end that screws into the metal frame.  can i screw both ground wires into the place where the one ground wire went to or do i leave it off?  do i cap it?  what do i do with that second wire?