<html> Ron, The agraffe shims are used to maintain a level string plane when the plate casting varies more than usual.  I haven't ever seen 3mm, but they can be high enough to notice sometimes. This is done for reasons of consistency of regulation.  In most Kawai grands, you can exchange actions in like models and the letoff regulation will still be very close. Don Mannino At 12:54 PM 8/6/01 -0500, you wrote: <blockquote type=cite class=cite cite>Tuning a K.Kawai KG-2A this morning, I got to looking at the low tenor agraffes. They each seemed to be sitting on a rather deep stack of spacers, and I wondered why. I'd noticed this before in some other Kawais, but hadn't pursued it until now. It looks like close to 3 millimeters of shims under that low tenor agraffe, and appears to taper down as it goes up scale. Was this to maintain string height relative to the keybed - to compensate for plate warpage, erratic spot facing, or????? I haven't had the chance to chase down some measurements on one of these to answer my own questions, so I'm asking if anyone knows the story on these. Ron N </blockquote></html>