<div>It's the expanding action brackets. You can get new ones I believe. The company that was making the actions for YC had a bad batch of pot metal when the made the brackets. It was under warrenty and takes about 5 hours to change them out.
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<div>Keith Roberts<br><br> </div>
<div><span class="gmail_quote">On 9/25/07, <b class="gmail_sendername">Cramer, Mark</b> <<a href="mailto:Cramer@brandonu.ca">Cramer@brandonu.ca</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">I worked on a 15-year-old Young-Chang grand for a new client today, and the action has REAL problems.<br><br>
Some of the issues I've either seen before, or read discussions about here on our list, i.e.: "bad knuckles & seized action centers."<br><br>However, one thing has me perplexed, and as I don't see very many of these instruments, would appreciate the experience of you those of you who have.
<br><br>The big question is why "ALL" hammers were blocking at the strings? (no let-off)<br><br>I gave all the buttons a quick 1/2 turn down and went ahead with tuning and assessment. What set me off though, is this is the same intial intoduction I had to one other Young Chang grand, four years ago, and I've yet to solve it!
<br><br>With that instrument, I followed the initial visit several weeks later with a re-tuning and a one-day regulation. That particular piano appeared much like brand new, and I was quite pleased (read "smug") with the results.
<br><br>When I returned six months later however, let-off had dropped below the point of drop contact! (?)<br><br>I spent a 1/2 hour poking around for clues... loose let-off rail, change in humidity, loose action brackets, severed key-bed, loose plate fit, etc., but came up "empty."
<br><br>So, I restored let-off, tuned, and left it at that.<br><br>A year later the client had moved, and I returned for tuning. The hammers were blocking once again! Yipes!<br><br>Now, seeing this symptom on another YC has me wondering what's at work here? Can anyone shed some light?
<br><br>BTW, I've read in past about YC action brackets "growing".<br><br>I've seen that about twenty years ago on a mid-century "Zimmerman" (East Europe/mid-quality). In that case, I had a machinist mill new brackets from aluminum. Nice work, but the orignals were so messed that determining original dimensions was a real chore!
<br><br>Neither bracket-sets on either of these actions though have the cracks and "bloated" appearance those Zimmerman brackets had.<br><br>Any clues?<br><br>much thanks!<br><br>Mark Cramer,<br>Brandon University
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