List, In working on a Kimbal grand that has been fitted with a piano disk system, the major complaint was "the piano disk unit causes lots of noise". I have done the following to quiet the unit but can still hear unwelcome noise. Bedded the key frame lubbed the frame drawer tightened all binding screws in the action, rim and case parts adjusted sustain I was not able to service the piano disk action parts that raise each key It is my belief that the most of the remaining noise is the result of the key stick being raised too fast or far so that when it returns to the key bed it does so with a clatter. Very softly but still a noise that is not heard when the piano is played by human means. Would replacing the balance rail felt punchings or front felt help?
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