<div>If you had one of Dale Erwins Action Ratio Kits you could measure the action ratio without having to worry about friction as a component. Basically it depresses a key 6mm for you and there is a mm measuring tool to measure the hammer rise. Then you read the ratio from the side of the tool. I just replaced the hammers on a 6'2 Grotrian and it had 5 leads in the bass just like the situation you describe. Grotrian moves the stack to find strike point and that put the capstans on the the back of the wippen heel, beyond the red underfelt in the center of the heel. The action ratio measured 1 to
6.3. I determined that moving the capstan to the front of the heel changed the action ratio to 1 to 4.8. When I put it slightly forward of center, the ratio was 1 to 5.5. I now have three leads max in the bass. The keys themselves have a lot of mass so now this piano plays like dream.
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<div>On the S&S, Moving the knuckle is the usual case but Steinway does move the stack on the key frame to find the strike point. Tokiwa is making really nice parts and has 17 mm knuckle placement shanks and whips that match. In Dale's shop I just did a Renner back action for a B and then a Tokiwa back action for somethindg. They were done almost side by side and I had less traveling and alignment to do with the Tokiwa parts. I was much happier with the wippens too.
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<div>Keith Roberts<br> </div>
<div><span class="gmail_quote">On 9/21/07, <b class="gmail_sendername">Paul T Williams</b> <<a href="mailto:pwilliams4@unlnotes.unl.edu">pwilliams4@unlnotes.unl.edu</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br><font face="sans-serif" size="2">Hi List!</font> <br><br><font face="sans-serif" size="2">Happy Friday!
</font> <br><br><font face="sans-serif" size="2">I am working on a 70's Sty B with a horrible action geometry problem. All the students and the professor hate playing it and I don't blame them! The line from key balance hole to wip has the capstan way too low making the DW close to 70g throughout. It has a renner action and hammers. the wips and capstans are such that I could relocate the capstans back by about 3-4mm. Would that make a big enough difference in the DW? It won't affect the line. I looked at raising the stack, but there isn't enough room to raise it more than 1-2mm. Should I try both?
</font> <br><br><font face="sans-serif" size="2">Also, is the measurement in Steinways made from center of balance rail hole on the top of the key, or from the back of the key? This is a new endeavor for me and I don't want to make things worse.
</font> <br><br><font face="sans-serif" size="2">Still green in Lincoln,</font> <br><span class="sg"><br><font face="sans-serif" size="2">Paul</font></span></blockquote></div><br>