<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Jim, <span class="Apple-tab-span" style="white-space:pre"> </span><div><span class="Apple-tab-span" style="white-space:pre"> </span>That sounds like someone didn't know what the heck they were doing. "Let's use wipp springs, so we don't need so much lead. Oh, my! the down weight is too low. Let's add lead to the backs of the keys to make it better." I don't know anything about Hornung and Moller (though my quick Google search shows that I looked up the firm in a European Piano Atlas about a year ago, so I must be an expert <G>). Is it a Danish piano, or is the name used by some Asian manufacturer? Or do you know?</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>I'd pattern lead it. </div><div><span class="Apple-tab-span" style="white-space:pre"> </span>The more basic question? Springs can be used to moderate the amount of lead, but the consensus seems to be that more than the equivalent of about 10-15 gms DW reduction makes the action perform "strangely enough to be problematic." Moderating the amount of lead reduces moment of inertia, which means the action "feels and performs" lighter - easier to get it moving - regardless of DW/UW. </div><div><span class="Apple-tab-span" style="white-space:pre"> </span>It's a good idea to unhook some springs and see just how much they are doing. And you can adjust them to "help" precisely 10 grams while you're at it, and see where that leaves you with lead.</div><div><div apple-content-edited="true"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Regards,</div><div>Fred Sturm</div><div>University of New Mexico</div><div><a href="mailto:fssturm@unm.edu">fssturm@unm.edu</a></div><div><br class="webkit-block-placeholder"></div></div></span><br class="Apple-interchange-newline"> </div><br><div><div>On Sep 23, 2008, at 5:51 PM, Jim Busby wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div lang="EN-US" link="blue" vlink="purple"><div class="Section1"><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">All,<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">I have an action (Hornung and Moller 1972) that has one or two leads in the very back of the key and no lead in the front. It has wippen helper springs. DW is around 65 – 70 and UW is around 36 - 40 or so. (Friction seems to be ok, but BW is 50 – 55!!)<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">I don’t know why the springs were adjusted for this weight, and I can adjust the springs to achieve a good weight (50-20 or so) but my question is a very basic one; Why would you use springs instead of leads to touchweight the action? What does this do to the MOI? Or, at the very least what is the difference in feel between a “spring” vs. “lead” touchweighted action? And, why do one over the other?<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Fred, Ric, enlighten me!<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Jim Busby<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">P.s. I experimented and put weights in about 8 keys and a normal leading pattern makes it work…normal.<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div></div></div></span></blockquote></div><br></div></body></html>