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<DIV>Hi, David I. and David S., and Colleagues -</DIV>
<DIV> </DIV>
<DIV>I took a look at the pedal plate on an 1889 Steinway, the oldest on the
premises at the moment. (I figured if there were an oddball thread to be
found it would be more likely the older the piano.) I found that screws
anchoring the pivot rod were garden-variety No. 8 32-thread x 1/2 inch flat head
machine screws. We have a box of these screws we keep on hand for the
occasional replacement.</DIV>
<DIV> </DIV>
<DIV>To David S.: 30-thread would be very odd indeed. There is no
current or recent (20th century) American, Canadian or British
standard thread at 30 pitch. And that's why many thread guages skip
that pitch. Metric threads don't quite approximate that either.
I accidentally deleted your post on the topic, but I recall you mentioned
measuring your screw diameter at something like 0.213 inch. That would be
about right for a No. 12 screw, which should be 28 pitch in the fine-thread
series.</DIV>
<DIV> </DIV>
<DIV>There would be no point in S&S using special threads for this
part. Common hardware is available to do the job and it would be
much more expensive to have custom-made screws and custom-made taps,
etc.</DIV>
<DIV> </DIV>
<DIV>Sidebar: I have a very nice South Bend Precision Lathe that cuts 48
different thread pitches. Conspicuously absent from that list is
30-pitch.</DIV>
<DIV> </DIV>
<DIV>Another Sidebar: It is not desirable to set these screws "gorilla
tight". Notice that the pivot rod makes contact with the screw very much
off center from the axis of the screw. Using a screw this way would be
considered abusive in some circles; it will cause the screw to break well below
the tension needed to break a screw with concentric loading. However,
tightening the screw moderately snug is more than adequate to hold the pivot
rod. It's another example of an elegant mechanical design from
S&S!!</DIV>
<DIV> </DIV>
<DIV><FONT lang=0 face=Arial size=2 FAMILY="SANSSERIF" PTSIZE="10">~ Tom McNeil
~<BR>Vermont Piano Restorations<BR>VermontPiano.com<BR><BR>346 Camp
Street<BR>Barre, VT 05641<BR>(802) 476-7072</DIV>
<DIV>
<DIV> </DIV>
<DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000
size=2><BR><BR><FONT size=3>I found one item in the archives on steinway pedal
plate machine screws. Tapping is an option...but has anyone determined
what the thread per inch is? Or do I have to go figure it out
myself?...;-] I can get the screws if I buy the entire pedal
system...;-[</FONT> <BR><FONT size=3> </FONT> <BR><FONT size=3>David
Ilvedson, RPTPacifica, CA 94044</FONT>
<BR></FONT></BLOCKQUOTE></DIV></FONT></DIV></FONT><BR><BR><BR><DIV><FONT style="color: black; font: normal 10pt ARIAL, SAN-SERIF;"><HR style="MARGIN-TOP: 10px">Get fantasy football with free live scoring. <A title="http://www.fanhouse.com/fantasyaffair?ncid=aolspr00050000000020" href="http://www.fanhouse.com/fantasyaffair?ncid=aolspr00050000000020" target="_blank">Sign up for FanHouse Fantasy Football today</A>.</FONT></DIV></BODY></HTML>