I have a current patent standing here in the USA for the application of bearings either as a resonance enhancement or to over damp and shut down vibrations.
Size and quantity dictate the application and outcome.
The patent applies to footers rods and tubes as used in audio components as well as some acoustic string instruments. Also applied to some cables .Works so well that others have violated this patent at least by shipping their product from over seas to the USA.
TomD
Tone Acoustics.