I shielded one of my basses recently with adhesive copper tape and when I tested it after reassembly there was no sound whatsoever. The cause was obviously that the body of one of the pots was touching the copper tape, so I needed to insulate the copper from the electronics.
After a little thought I cut a slice from the middle of a plastic drink bottle (lidl morello cherry sparkling fruit crush), trimmed it to size and put that so it lined the shielded cavity preventing anything attached to the control plate from touching the copper. It worked really well, so I've cut several more to keep in one of my bits boxes ready for next time this issue arises.
i thought sharing this tip might help someone in the future.