<html> <body> Shigeru Kawai key dip spec is 10.3 mm. & I kind of imagine the others are also. Avery At 09:49 AM 11/4/2005, you wrote: <blockquote type=cite class=cite cite="">On Nov 4, 2005, at 9:33 AM, <<a href="mailto:lafargue@bellsouth.net">lafargue@bellsouth.net</a> > wrote: <blockquote type=cite class=cite cite=""> Key dip is approx 3/8".</blockquote> I wondered if this might be the case.  Don didn't mention what the spec was, but I'd say 3/8" is waaaay shallow.  The shallower the dip, the less movement the backcheck makes during travel, so what's happening is to get the hammer to check anywhere inside of an inch, you're having to regulate the backchecks too close to the tails at rest, causing them to catch on the way up, and yes, they might even catch on the way down. <blockquote type=cite class=cite cite="">  Sorry Ron, I still can't see how checking height would affect that.  </blockquote> It's a combination of checking height and too shallow of dip.  I think most Asian pianos use 10 mm, but I don't have a block for that, and I'm not sure what the exact conversion to inches is.  Most of the time, I shoot for somewhere closer to 13/32" in Asian pianos, and that usually works. Jeff Jeff Tanner, RPT University of South Carolina </blockquote> <x-sigsep></x-sigsep> _______________________ Avery Todd, RPT Moores School of Music University of Houston Houston, TX 77204-4017</body> </html>