The alleged "magic line" as described in the Renner backaction kit instructions actually interesects the underlever/keyend felt contact point at full dip, not the lever/capstan. At any rate, this will indeed often require lowering the tray, sometimes even below the dags. I've found nothing magical about this line whatsoever and have experienced no advantages from trying to achieve this geometric prerequisite. The vertical axis of the tray may simply be found by allowing the tray to be somewhere in the neighborhood of 15 degrees at rest and about level at full dip. Jude Reveley, RPT Absolute Piano Restoration, LLC Lowell, Massachusetts (978) 323-4545 ----- Original Message ----- From: "John Delacour" <JD at Pianomaker.co.uk> To: <pianotech at ptg.org> Sent: Friday, December 26, 2008 2:58 PM Subject: Re: [pianotech] but will it split > At 10:29 -0800 26/12/08, Gene Nelson wrote: > >>Must take care then if also trying to reposition the tray to conform >>to the magic line from balance rail pin through lever/capstan >>interface and lever center. On the few Steinways I have done this >>way it will usually reposition the tray lower in the cavity. > > I don't follow. Doing it the way I suggest or some way similar, eg. > routing the front of the tray and adding a strip below to allow for > the screw length, everything rests and moves in exactly the same > place as before give or take the micro-adjustment you installed the > screws for. > > JD > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20081226/eeb906a3/attachment.html>
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