<table cellspacing="0" cellpadding="0" border="0"><tr><td valign="top" style="font: inherit;"><div>Probably just different batches of lead that made the weights but got all tossed into a bin and mixed together.<br /><br />Thumpe</div></td></tr></table>            <div id="_origMsg_">
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                                <span style="font-weight:bold;">From:</span>
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                            Allen Wright &lt;akwright@btopenworld.com&gt;;                            <br>
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                                <span style="font-weight:bold:">To:</span>
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                             &lt;pianotech@ptg.org&gt;;                                                                                                     <br>
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                                <span style="font-weight:bold:">Subject:</span>
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                            Re: [pianotech] Expanding leads                            <br>
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                                <span style="font-weight:bold;">Sent:</span>
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                            Wed, Mar 13, 2013 12:56:56 AM                            <br>
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                                        <td valign="top" style="font:inherit;">Wim,<div><br><div><div>On Mar 13, 2013, at 12:31 AM, <a rel="nofollow" ymailto="mailto:pianotech-request@ptg.org" target="_blank" href="javascript:return">pianotech-request@ptg.org</a> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse:separate;font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;orphans:2;text-indent:0px;text-transform:none;white-space:normal;widows:2;word-spacing:0px;font-size:medium;"><br>Again, if it is the wood, why are some leads corroding, and some are not, in the same piano? Or is there that much difference in the fibers of a set of keys that makes some leads corrode, and not others? Or, since keys are made from three or four boards end glued together, with one or more boards coming from different trees, is
 there that much difference in the acid content from one pine tree to another?<span class="Apple-converted-space">&nbsp;</span><br></span></blockquote><div><br></div>Could be. Why couldn&#39;t different parts of the same tree have different amounts of acids? There could be all sorts of subtle variables. I&#39;m not an expert in the area. But it&#39;s nice at least to have a more accurate understanding of what the problem is (according to very motivated experts who have studied the issue), rather than just assuming that it&#39;s humidity.<br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse:separate;font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;orphans:2;text-indent:0px;text-transform:none;white-space:normal;widows:2;word-spacing:0px;font-size:medium;"><br>So it seems that in order for the corroding problem not to surface again, perhaps the only real
 solution is a new set of keys, made from basswood, weighted with a set of electroplated leads. Yeah, right. Try to sell that job to a customer with a 50 year old Kimball spinet.<span class="Apple-converted-space">&nbsp;</span><br></span></blockquote><div><br></div>Maybe it&#39;s simply an insoluble problem that we have to live with, and the best we can do is provide purely symptomatic treatment. At least we&#39;ll be giving people a more accurate prognosis.</div><div><br></div><div>I&#39;d recommend reading the study, though (if you haven&#39;t). It&#39;s quite fascinating.&nbsp;<br></div><div><br></div><div>Allen</div><br></div></td>
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