Bruce, this sounds arcane but here's what I did to resolve simular issue of the speakers moving, First I used the "rubber shimmy" idea, and put a few peices of rubber aound the tower -- then I wrapped a layer of electrical tape around my tower, exposing some of the rubber peices, then used grip tape and held it in place with the electrical tape. Afterwards tightened the hell out of them. My speakers havent moved in two years since I did this...
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