Hello, Thanks for remembering this. Checking the key height stay the most important point in any regulation in the end, grand OR vertical. I believe it is because the "magic line" is more sensitive on verticals, depending of the height of the capstans, key level a little low means a lot of trouble then. I guess you where not only talking of the lack of key dip because of the keybed sag. Best regards. Isaac OLEG -----Message d'origine----- De : caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]De la part de Ray Diederichsen Envoyé : vendredi 23 avril 2004 22:25 À : College and University Technicians Objet : Re: Re. Bobbling hammers on Yamaha upright We have had some bobbling hammers on almost brand new Yamaha U5s (and some older ones, too) here at University of Nevada, Reno. Check your key dip. A couple of appropriately placed business cards under the balance rail might fix things up real fast. Seems the key beds start to sag just enough to give trouble soon as the piano drys out. Try it, you'll like it. Ray Diederichsen University of Nevada, Reno _______________________________________________ caut list info: https://www.moypiano.com/resources/#archives
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