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Yamaha flange cord replacement
In the 1960's through the mid 1980's, Yamaha used a low-quality silk cord in their upright hammer flanges. The purpose of the silk cord is to retain pressure on an important spring called the hammer return spring, whose job is to assist in the return of the hammer to proper rest position, permitting ease of repetition. With age, the low-quality silk cords become brittle and break, rendering the hammer return springs non-functional.
Symptoms of broken flange cords include:
1. Notes that double-strike or "dribbling hammers" (the note sounds multiple times, even though the respective key was only struck once).
2. Lack of ability to repeat notes properly
3. In some cases, keys that make no sound
In the 1980's, Yamaha corrected the silk cord quality, and the issue has not returned in pianos manufactured since then. If you own an older Yamaha upright that has broken flange cords, I recommend replacement of your piano's hammer flange/silk cord assemblies, so that the hammer return springs can do their job, and permit the piano to function properly. Feel free to contact me for an estimate.
hammer return springs dislodged due to broken flange cords
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