Audrey Karabinus posted: >>I have seen 2 instances of grand pianos that wobbled (not due to leg seating or loose joints) when on thickly padded carpeting in combination with caster cups, that were stabilized by the removal of the cups. Anyone else seen this quirck?<< Just came across that today. Temporarily installed those large plastic caster cups to keep the verdigris infested casters from staining the newly installed pile carpet. Sure enough, the piano lost its stable contact with the floor and wobbled perceptibly. Keith A. McGavern, RPT Oklahoma Chapter
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