<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Re: Schwander action where jacks don't return</title></head><body> <div>At 7:30 AM -0400 9/8/04, Cy Shuster wrote:</div> <blockquote type="cite" cite><font size="-1">... About half a dozen keys wouldn't play, because the jack wouldn't return under the butt.  Regulation was OK.</font></blockquote> <div><br></div> <div>Cy,</div> <div><br></div> <div>Without going into semantics, if regulation were okay, those half dozed keys would play.</div> <div><br></div> <blockquote type="cite" cite> <font size="-1">Stretching the jack return springs fixed the problem on some notes, but not all.  >From what I could see, there was a center pin in the jack, but no bushing (none that showed, anyway).</font></blockquote> <div><br></div> <div>Unless it has fallen out or wasn't put in there in the beginning, I assure you, there is a bushing in the jack assembly whether you see it or not.</div> <div><br></div> <blockquote type="cite" cite><font size="-1"> Is the right fix a new spring, repinning, or lubing the action center?</font></blockquote> <div><br></div> <div>The right fix is for you to determine the actual cause.</div> <div><br></div> <div>A person does this by examining the worst offending jack assembly and checking the pinning for freedom of movement. If there is none, correction is required. This act is part of the regulation process.</div> <div><br></div> <div>If there is freedom, then something else is contributing to this problem. Maybe lost motion, maybe excess friction in the key bushings/balance rail holes, maybe both, maybe something else.</div> <div><br></div> <div>You gotta investigate, man. Discover the cause, decide the cure.</div> <div><br></div> <div>Keith</div> <x-sigsep><pre>-- </pre></x-sigsep> <div>Keith McGavern<br> Registered Piano Technician<br> Oklahoma Chapter 731<br> Piano Technicians Guild<br> USA<br> </div> </body> </html>