[DMcMahon]

Yes a similar model Ferguson schematic confirms that Lawrence's input that the cable screen/braid connects to the end of the volume pot where the 2.2MOhm resistor connects to is correct.

Can see this fixing hum but unsure if it would fix the volume pot not working issue, hope it does though.

David

Update - thinking about it more the screen/braid on the schematic connects to ground which in turn grounds the bottom end of the 2.2M resistor, with the screen disconnected then the resistor is effectively floating which might result in the audio signal getting through the pot but not be adjustable.