thanks Jon, I wonder if that was Bob Hopf's article. Every A/M supplier seems to claim their parts are the only *authentic* version of the three historic Steinway knuckle positions. So prior to the last parts change-out, I took photos of jack alignment with NY Steinway shanks and two prominent aftermarket supplier's versions of the post 84' knuckle spread. The NY part lined up the jack nicely, and one of the aftermarket shanks was close (within .5mm) but the other was kinda sad...more than 1mm out, even with the core tilted, so your advice is well taken. Mark Cramer On 02/06/2010 3:47 PM, Jon Page wrote: >> I would probably go with a hammer length that allowed sufficient >> blow but maintained the shank 90 degrees to the jack at rest >> and with the core of the knuckle in line with the jack center. >> >> To maintain a 90 degree hammer to string contact, >> pitch the hammer bore. > > That is to say, 'the shank at 90 degrees' as measured from > the center of the core to align with the jack center. There > was a great PTJ article on Action Elevations some years back. > > I've used the Hamburg shank & flange on the last two actions > to get the core positioned out to align with the center, plus to > get more room for the jack between the knuckle and rep stop felt. > Hamburg flanges position the center ~1 mm more distal. > -- > > > Regards, > > Jon Page -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100602/7c36b4ff/attachment.htm>
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