<html> <head> <style></style> </head> <body class='hmmessage'><div dir='ltr'> David,<br><br>exactly that. Obviously your German is better than my English :-)<br><br>This wondrous technique was discussed in a German forum, too. The question was if that is not a little bit too esoteric. But Stefan Knüpfer is not known for esoteric stuff, he believes in physics. A German collegue wrote that his grandfather used that procedure too (but not with a jig saw but by hand). In the end nobody was able to explain why it should work, but some claimed that it works. Whatever working means in this context.<br><br>Gregor<br><br>------------------------<br>piano technician - tuner - dealer<br>Münster, Germany<br>www.weldert.de<br><br><br><div><hr id="stopSpelling">From: firtreepiano@hotmail.com<br>To: pianotech@ptg.org<br>Date: Fri, 30 Sep 2011 07:50:54 -0700<br>Subject: Re: [pianotech] FW: what is this?<br><br> <meta http-equiv="Content-Type" content="text/html; charset=unicode"> <meta name="Generator" content="Microsoft SafeHTML"> <div dir="ltr"> <div style="font-family:'Eras Medium ITC';color:#000000;font-size:12pt"> <div>My reading of the German is that he is speaking to freeing up a stuck system. He had a piano that had not been played in a long time, and his sense was that the soundboard, etc., would not move freely until it had gotten used to moving again. Breaking loose the grain. Overcoming “sticktion.” Car engines and suspensions will sometimes act stiff until they are driven a while.</div> <div> </div> <div>Sounds like loose logic to me, but if he got results, it is worth pondering.</div> <div> </div> <div style="font-family:'Eras Medium ITC';color:#000000;font-size:12pt">David Stocker, RPT<br>Tumwater, WA<br><br></div> <div style="font-style:normal;display:inline;font-family:'Calibri';color:#000000;font-size:small;font-weight:normal;text-decoration:none"> <div style="font:10pt tahoma"> <div> </div> <div style="background:#f5f5f5"> <div style="font-color:black"><b>From:</b> <a title="formsma@gmail.com" href="mailto:formsma@gmail.com">John Formsma</a> </div> <div><b>Sent:</b> Friday, September 30, 2011 05:59</div> <div><b>To:</b> <a title="pianotech@ptg.org" href="mailto:pianotech@ptg.org">pianotech@ptg.org</a> </div> <div><b>Subject:</b> Re: [pianotech] FW: what is this?</div></div></div> <div> </div></div> <div style="font-style:normal;display:inline;font-family:'Calibri';color:#000000;font-size:small;font-weight:normal;text-decoration:none">Yeah, right. :) I'm not agreeing that you can put energy into a soundboard with a tennis ball. I mean, yeah, you can, but it comes right back out. Just like when a hammer hits a string. Nothing gets stored like in a energy reserve. <div> </div> <div>-- <br> <div>John Formsma, RPT<br></div> <div>Blue Mountain, MS</div> <div> </div> <div> </div> <div class="ecxgmail_quote">On Fri, Sep 30, 2011 at 4:18 AM, Gregor _ <span dir="ltr"><<a href="mailto:karlkaputt@hotmail.com">karlkaputt@hotmail.com</a>></span> wrote:<br> <blockquote style="border-left:#ccc 1px solid;padding-left:1ex" class="ecxgmail_quote"> <div> <div dir="ltr">Here is a cutout of an interview with Stefan Knüpfer about that question:<br><b>Basicaly it says this in English:</b><br><br><br>Why to use a tennis ball in a grand?<br>Long time no play, piano is like sticked in the mud, it needs energy to move and swing free again. The idea is to put energy into the soundboard not via the action but from above with the aid of a tennisball of a jig saw. It knocks the piano beautyful soft and it gets a free tone.</div></div> <div dir="ltr"> </div></blockquote></div> <div> </div></div></div></div></div></div> </div></body> </html>