It would not be the first time I have come across a heavy helical spring under the damper tray. S&S "A" for example... As for leads? They are to be found in many an action damper lever...Whether both are to be found in the same piano - I don't recall. Regards Michael G.(UK) ----- Original Message ----- From: "William R. Monroe" <pianotech@a440piano.net> To: <ilvey@sbcglobal.net>; "Pianotech" <pianotech@ptg.org> Sent: Wednesday, May 11, 2005 3:32 AM Subject: Re: springs vs. lead > Just a guess here David, but I would think you would have to use an awful > lot of lead to get the return rate that you get with springs. Springs > allow > for a graduated resistance, increasing as the pedal is depressed further. > Weighting might also allow the upper assy. (e.g. tray) to loose contact > with > the trapwork levers, causing some knocking noise. Speculation here. > Maybe > not............ > > Respectfully, > William R. Monroe > > > ----- Original Message ----- > From: "David Ilvedson" <ilvey@sbcglobal.net> > To: <pianotech@ptg.org>; <caut@ptg.org> > Sent: Tuesday, May 10, 2005 9:15 PM > Subject: springs vs. lead > > >> We all come across noise from springs in pedals. Why couldn't we > eliminate the spring and use key leads inserted into, for instance the > damper lifter tray, pedal levers...places where springs are used to return > parts...? >> >> David Ilvedson >> >> >> >> >> _______________________________________________ >> pianotech list info: https://www.moypiano.com/resources/#archives >> >> > > >
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