My understanding (and this from the Young Chang technical rep several years ago) is that the sole purpose of those screws is for factory work only, to enable them to put the action in and out quickly to the right location. The cheek blocks are supposed to locate the action in the field. Part of new piano prep work should include turning those screws in to provide clearance with the back of the keyframe. Otherwise binding can occur during una corda operation. I'd recommend you check your cheek blocks. Dean Dean May cell 812.239.3359 PianoRebuilders.com 812.235.5272 Terre Haute IN 47802 -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of John Formsma Sent: Thursday, June 07, 2007 5:12 PM To: Pianotech List Subject: Re: Henry F. Miller fallboard problem It turned out to be a pretty obvious solution. The real clue was the backcheck hung on the sostenuto bracket. Once the action was removed, you could see there were no adjusting screws in the keyframe stop (a.k.a. dag). The keyframe had worked its way back, causing the clacking of the sharps on the fallboard. With screws in there now, and the keyframe in correct position, everything is fine. Duh, I should have seen that right away. Curse my non-mechanical, artsy-fartsy brain. <G> It's learning, though. JF On 6/6/07, Phil Bondi <phil at philbondi.com> wrote: > John, you mentioned everything except key height to fix the > fall board problem..although I have never heard of seasonal > changes in key height. > > Personally, I would check key height before moving the fall > board..although I have never heard of seasonal changes to > fall boards either. I may be off with both of those > 'non-observations'. > > -Phil Bondi(Fl) > > >
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