Renner USA Used by the World's Finest Piano Manufacturers for More Than a Century  
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Underlever System

Underlever picture

The Underlever System, or Back Action as it is commonly called, is not visible to the pianist but controls the intricate system of levers and felt which dampen the strings causing the sound to stop. Most vintage pianos being restored need a new back action also, and this unique component design allows it to be custom fitted to every model of Steinway, Mason & Hamlin, Chickering, Knabe, and most other quality grand pianos.

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