I modified my 11year old XS by replacing and relocating the headphone and coil plugs.The original coil plug has the transmit wire and receiver wire(both shielded wires)going thru a large ferrite bead to the coil plug where the shaft connects.There is also a black wire from the circuit board going thru the same ferrite bead towards the coil plug which I found unconnected.Im not sure if I broke the wire or if its supposed to be that way.Can anyone tell me if/where the black wire terminates at the plug or if it stays open ended...Thanks for any help.Ralph