Well, it seems like 6 penny's is the magic number for this penny tweak. I'm using duck tape to wrap around the penny's, I took three penny's and stacked them and then wraped them in duck tape then I did three more the same way and stacked them and put duck tape around the 6 penny's. I use three of these under each component. I heard about this tweak over at Positive-Feedback magazine.
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