I searched on 'tray' but didn't see a thread with photos. I used an oven tray with a sheet metal lid to get rid of the noise completely. Without the lid, the noise is far less, and with the lid, no noise at all. Just like a pedal - only I can tweak things easily just by lifting the lid. I sanded down the top rim so it would make good contact with the lid. I was hating trying to tweak breadboards because of the noise. Loving breadboarding again 
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