Paul, I agree with everyone who has suggested frontrail bedding as the most likely cause. However, 2 other knocks that have fooled me in the past: 1: Uneven key spacing combined with worn front rail bushings and/or loose front rail pins combined with pianist technique striking the furthest keys with a motion as much sideways as downward, causing keys to knock on neighboring keys. 2: Loose leads in damper underlevers. Mike On 12/12/2010 10:09 PM, Paul Mulik wrote: > Hello list, > A couple of days ago I did a couple of tunings for a church, and just > as I was about to leave they asked me to have a quick look at a third > piano, a Kawai KG-2S grand. I literally had one minute to look at it, > as the choir was entering the room to practice. I didn't have time to > pull the action. > Anyway, the lowest 5 or 6 bass notes had, in addition to their normal > sound, a knock, like wood knocking against wood. Is this likely to be > due to a gap between the key frame and the keybed, or should I look > for something else? I'm going back on Monday to have a better look. > Thanks, > Paul Mulik, Joplin MO -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20101213/06ffa299/attachment.htm>
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