There are some old threads out there, but I'm curious about my specific problem. I have a Skyline Duck Dunn P-Bass. Some time ago, I replaced the mint/white pickguard with a custom black one from Jeannie's. The old guard had a small amount of adhesive foil underneath it, just around the volume and tone control holes. The new guard does not. Ever since I put the new guard on, it buzzes. It never used to buzz, at all. I'm making the assumption that the missing foil / shielding around the holes is why it buzzes now. I'm guessing that foil grounded it by touching the volume and tone knobs, as there is no other shielding in the bass at all. Anyone else encounter this? Did you put copper shielding or something else around the holes or did you shield everything (all cavities, etc)? The old guard's shield isn't copper. It looks more like coated aluminum or tin. Experience? Thanks!