There should be a narrow cardboard shim on the bottom of the cheekblock. With some care you can use a razor blade or sharp knife to remove some layers from the cardboard. This will give you more downpressure on the keyframe. pin, if that turns out to be the problem. Ry <div class="gmail_quote">On Tue, Mar 29, 2011 at 11:53 PM, David Nereson <<a href="mailto:da88ve@gmail.com">da88ve@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Or the left (bass) keyblock screw isn't tight, or the keyframe guide pin hold-down is loose or isn't really holding down the left end of the keyframe, thus allowing the end of the keyframe to sit above the keybed a tiny bit, and slapping against it when playing the lowest keys. Also check the damper upstop rail and the keystop rail for loose screws. --David Nereson, RPT<div class="im"> ----- Original Message ----- From: "Don Mannino" <<a href="mailto:donmannino@ca.rr.com" target="_blank">donmannino@ca.rr.com</a>> To: <<a href="mailto:pianotech@ptg.org" target="_blank">pianotech@ptg.org</a>> Sent: Tuesday, March 29, 2011 5:28 PM Subject: Re: [pianotech] Bass Key Slap </div><div><div></div><div class="h5"><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> My first thought is the keyframe needs bedding. Don Mannino -----Original Message----- From: <a href="mailto:pianotech-bounces@ptg.org" target="_blank">pianotech-bounces@ptg.org</a> [mailto:<a href="mailto:pianotech-bounces@ptg.org" target="_blank">pianotech-bounces@ptg.org</a>] On Behalf Of Arlie Rauch Sent: Tuesday, March 29, 2011 4:27 PM To: <a href="mailto:pianotech@ptg.org" target="_blank">pianotech@ptg.org</a> Subject: [pianotech] Bass Key Slap I was tuning a customer's Steinway today, and she wanted me to look also at her Schimmel grand. She heard noises, in the key she thought, in the lowest notes. I couldn't hear it at first, but then I did when thumping the lowest 8 or so notes--it sounded like a slap when the bottom of the key contacted the front rail felt. First I thought maybe the front rail felt is too hard, but on my hour-drive home, I thought maybe the cause is elsewhere. Why can you hear that on the lowest bass notes, but when you play up higher the sound is gone? Maybe something is loose at the bass end in the action or the keybed. Any suggestions? I hope to remedy this sometime when I go back. Arlie Rauch Glendive, MT </blockquote> </div></div></blockquote></div> -- Ryan Sowers, RPT Puget Sound Chapter Olympia, WA <a href="http://www.pianova.net">www.pianova.net</a>