[pianotech] wooden click at letoff?...reprise

[David Skolnik]

Jim -
While you don't seem to have swapped out the reps themselves, you 
appear to have focused in on the damper mechanism as a variable. (I 
wrote the following before re-reading your post re: dampers, but 
thought it worth mentioning:   Did you notice whether the jacks were 
centered in the rep slot? or whether the pinning of the jacks was 
firm?  Off-center jack can either contact wood or glue (jack stop felt).

Zeno's point, re: damper stop rail felt is good, however, that would 
seem immediately evident when testing individual damper lift.  Wim's 
observation also good.  Did you check for any glue or hardness on the 
key-end felt?

David Skolnik


At 09:19 PM 1/4/2013, you wrote:
>An unsuccessful followup on this post from November...
>
>Got back back to this 10 year old Renner action with a recalcitrant 
>click at and after letoff. There are now 2 of them, F1 & G#1.
>
>I had thought originally that the sound was from the shank assembly, 
>so I appeared armed and ready for knuckle changing or shank 
>changing. Removed and re-glued both knuckles, then set about putting 
>in a Dampp Chaser. Finished the DC and  listen for the click...still 
>there...rats.
>
>Swapped a nearby quiet shank, and carefully regulated the swapped 
>shank so I got the full and proper letoff/aftertouch event. The 
>swapped shank produced the same click as the original shank. So my 
>original assumption that the shank was the culprit was too hastily 
>decided. Started looking around.
>
>-F1 had an anamolous geometry issue. JAck was smacking the jack stop 
>felt, while all the other notes including  the other offending note, 
>G#1, were just fine at the jack stop felt. Removed half the jack 
>stop felt from F1...click remained. The jack toe is definitely set 
>at a lower angle than the other whips, and jack travel is more than 
>the other whips, but it doesn't seem to be the source of the sound, 
>as I removed enough felt to leave some clearance.
>
>-looked for flange issues on two whips (turbo). G# cracked on one 
>side of the flange, but F1 fine.
>
>-Then in messing around, I lifted the dampers with the pedal, and 
>tried both notes again.  This time the click on both notes 
>disappeared! I suspected a loose lead in the damper levers. Took out 
>the action played with the offending damper levers, but as time was 
>way past up, and had to clear out, I couldn't remove the levers to 
>check the weights on this visit. In moving the levers there was no 
>noise, but I don't think that is a fair indication of anything, 
>since connection to the back of the key is their path to the click 
>amplifying keyframe/keybed...though there is a felt interface beween 
>damper lever and key which I would think would mitigate at least some noise.
>
>Question?...does this sound like the modus operandi of loose damper 
>lever weight?  Why would damper lever weights click at and after 
>letoff? Let off does impart a kick to the key, which might rouse the 
>offending leads, but I'm still somewhat sceptical...but running out 
>of ideas. I scheduled a DC followup tuning in 3 weeks, so I have an 
>imminent rematch.
>
>Jim Ialeggio
>
>
>
>
>
>--
>Jim Ialeggio
>jim at grandpianosolutions.com
>978 425-9026
>Shirley Center, MA
>
>
>
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