<html> Bruce, Based on your message, it sounds like you should follow the usual bedding procedure for all 3 rails.  Raise all the balance rail glides until they all knock, then bed the back and front rails by sanding the lip or ridge in the rail bottoms at the tight areas until the knocks stop.  Kawai action rails are designed to be bedded flat all the way across the rail, and the keyframe guides are there for front-to-back location. After the front and back rails are well bedded, then turn down the balance screws until the knocking just stops.  You should be able to induce a knock by lifting on the hammer rail while tapping on the balance rail with the other hand.  This indicates that you haven't turned the balance rail screws down too far. If the lip has been sanded off on the front rail, then it might be necessary to build it up again by gluing a strip of veneer underneath, at least in the knocking areas.  Keep in mind that any time you add something under the front rail, you are affecting key dip. Good luck Don Mannino RPT Kawai America At 11:28 AM 6/10/2003 -0400, you wrote: <blockquote type=cite class=cite cite>I've been servicing a 1985 Kawai KG2D for a few years which has a chronic problem with keyframe knocking.   This piano is located in a church where it is used for concerts as well as services.  Though I'm experienced with the levelling procedures, this one has continued to defy me.  It's the type with 3 half-hidden glides which can only be adjusted from the underside, in addition to the usual tuning pin type adjusted from the topside.  These are all on the center/balance rail with none for the front rail.  Also, the treble keyend block does not contact the keyframe pin at all and is not adjustable in this regard.   Wary of damaging the polyester finish, I don't want to experiment with the endblocks unless I know what I'm doing.    I'm wondering if there should be glides at the front rail.  Out of  sheer frustration last time, I got a couple thumbtacks from the secretary & put these on the underside of the front rail and it worked. So far no more knocking, but I'm to tune the piano again this week and wonder if there's a more "professional" fix, or cure, for this situation.  I'm speculating that if glides should be installed on the front rail or keybed, this would alleviate the endblock situation.   So, if anyone has had experience with this type of situation, I'd appreciate your advice. Thanks, Bruce Greig</blockquote></html>