Does anyone have an idea what the top action, keys and keyframe weighs for a Steinway & Sons D, L, M and S or for various Yamahas like a C7, C5, C3 ? I am working on a design for a work surface but need to have an idea of the weight I need to support so there is no sag or flex...
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James Kelly
Pawleys Island SC
843-325-4357
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