Hi Ed, Could you give us a bit more information? Was the SOS working OK before you removed the rod to repin? Are sections of the SOS working correctly? Which section is not, and what are the symptoms? Where does the knife blade rotate to relative to the horizontal key bed? 3 o'clock (as viewed from the treble end)? More or less? As pointed out, the tabs need to be in a (more or less) straight line. Are some catching and some not? This symptom is characteristic of at least a few significant possibilities: knife edge not rotating far enough; rotating too far; knife edge too far rearward (grabbing and noisy) or too far forward (some tabs catch, some don't); knife edge too high or too low. Do you have the Steinway SOS spring gage that assists in setting the height of the rod relative to the keybed, and ditto on the underside of the tabs. I assume the piano is not in your shop. Need more info. This should be a relatively easy fix if all the components are steady, properly bushed, and working from the pedal to the rod. Nick On Tue, Jul 20, 2010 at 5:48 PM, Ed Carwithen <edwcarw at yahoo.com> wrote: > I need help getting the adjustment right on the sostenuto mechanism of a > 1918 Sohmer 9 foot grand. > > This is a piano that I have been servicing for several years but one > section of dampers has always been a problem. I knew that I would have to > repin the under lever flanges some time and this past week was the time. > > In order to get to the under lever flange screws I had to unhook the > sostenuto rod. I got the flanges repinned and back and they work fine, but > now I can't get the sostenuto regulated. I have fiddled with it (and > fiddled with it; and fiddled with it) but just can not get the tolerance > correct. > > Any suggestions from the collected wisdom of this website would be greatly > appreciated. > > HELP!!!! > > Ed Carwithen > John Day, OR > > -- Nick Gravagne, RPT AST Mechanical Engineering -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100720/454fa339/attachment.htm>
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