I've been working on what should be a simple pickup switch in a 90s Les Paul Classic. I installed new CTS pots and Jensen PIO caps in a RS prewired harness and Duncan Ants. When I hold the guitar up without touching the strings, there is a light hum (I know, maybe it doesn't know the words ... ). The tailpiece ground is soldered on, the terminals are wired correctly, there are no cold solder joints and the output jack is fine. However it looks like there's been a history of ground issues with the guitar, since a previous owner installed copper shielding foil in the pickup cavities and on the inside of the control and switch covers, and even soldered wires from the back of a pot to the cover and (this is the fun one!) from the switch output -- not the ground -- to the switch cover. I've fixed the obvious problems, but think the two remaining possible issues are the switch itself and the four-stranded cable from the switch to the control cavity. I know where to find a switch, but where do I find the cable/wire? Thanks in advance for your help!