After you thought we'd exhausted this subject and then the original thread was hijacked with folks talking about foil on TV antennas (not very pertinent to bass guitars, obviously)...I have some new news to report. I have found a way to make Aluminium foil work well as a shield material. I simply bought some double-sided cloth carpet tape (the stuff used to hold down the edges of carpeting). I then laid the foil flat (shiny side down) on a table...I unrolled a length of the tape and pressed it into the foil firmly...and then I simply trimmed the excess foil. now with the foil firmly bonded to the cloth tape...I cut smaller pieces as needed from the larger piece. Then I removed the backing and stuck it into the control cavity. With the cloth mesh firmly stuck to the foil, the foil is flexible, not subject to tearing and sticks great. It's not solderable like copper foil, but it covers great and it works like a champ. I covered all the cavity of my wishbass this way and testing with an ohm-meter showed that I did not have to do anything to as far as electrically joining the edges...(good continuity throughout)... Now I can play my bass without any noise in my practice shed (which has lights on a dimmer circuit)...before this I had to play in the dark, because the buzz was so annoying... now....dead quiet... oh yeah...I got the tape at Big-W (like K-mart here in Oz) for <$7 AU for 5m X 50mm (2") roll. It looks good, too. I'm so satisfied, that I've another bass that is going to get the same treatment this week.