<DIV> <DIV>James Ellis <claviers@nxs.net> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> Touch weight and inertia are NOT the same thing at all. "Tough weight" is merely a measure of static force. "Inertia" is a dynamic quantity. Neither is front weight the same thing as moment of inertia, which I have already said. That's why putting more leads closer to the center of the keys will result in less "KEY" inertia. You will have to use more lead, but the "key" inertia will be a little bit less. However, the keys are NOT where most of the total action inertia comes from. It comes from the hammer heads out on the ends of the shanks, because that's where the (mass x velocity squared) is concentrated. All I'm saying is that moving the leads closer to the centers of the keys is not going to buy you very much, because that's not where most of the total action inertia is coming from in the first place. But then that is the only place we can change the moment of inertia, unless we lighten the hammer. What it will do is weaken the keys, especially if you drill more holes, plug holes, etc. That's probably not going to be a problem. Those two things are about all it will do for you, other than just making the keys heavier in the middle. So, before you haul off and re-do a whole set of keys, drilling more holes, adding more leads, plugging holes, and moving all the leads closer to the center, remember: It won't buy you very much towarding lowering the overall action inertia, because that's not where it's coming from, but it will definitely weaken the keys. If we are going to change the front weight anyway, because we are also changing out hammers, the MOI might as well be dealt with then too. Merry Christmas, Jim Ellis _______________________________________________ caut list info: https://www.moypiano.com/resources/#archives</BLOCKQUOTE></DIV></DIV> Vince Mrykalo University of Utah<hr SIZE=1> Do you Yahoo!? <a href="http://pa.yahoo.com/*http://us.rd.yahoo.com/evt=21260/*http://photos.yahoo.com">New Yahoo! Photos - easier uploading and sharing</a>