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<DIV dir=ltr align=left><SPAN class=234273803-13122006><FONT face=Arial
color=#0000ff size=2>I just did my first Yamaha cord repair job using the method
Jon posted from the archives a couple of years ago. It went really well.
Attached is a picture of my son gluing down the second end. You can see all the
cords sticking up to his right with the first end glued down.
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<P class=MsoAutoSig><B><SPAN
style="FONT-SIZE: 22pt; COLOR: navy; FONT-FAMILY: 'Bradley Hand ITC'">Dean</SPAN></B></P>
<P class=MsoAutoSig style="MARGIN: 0in 0in 0pt"><SPAN style="COLOR: navy">Dean
May cell
812.239.3359 <o:p></o:p></SPAN></P>
<P class=MsoAutoSig style="MARGIN: 0in 0in 0pt"><SPAN
style="COLOR: navy">PianoRebuilders.com 812.235.5272 </SPAN></P>
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<FONT face=Tahoma size=2><B>From:</B> pianotech-bounces@ptg.org
[mailto:pianotech-bounces@ptg.org] <B>On Behalf Of </B>Jon Page<BR><B>Sent:</B>
Saturday, January 08, 2005 2:26 PM<BR><B>To:</B>
Kentucky1248@aol.com<BR><B>Cc:</B> pianotech@ptg.org<BR><B>Subject:</B> Yamaha
Hammer Spring Cord Repair..from the archives<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV align=center><FONT size=4><B>Yamaha Hammer Spring Cord Repair
<BR></FONT></DIV>Problem: <BR></B> Hammer return spring cords have become
fragile and are breaking. <BR><BR><B>Symptoms:</B> <BR> Cords have turned
a brownish color. <BR> Random breakage is occuring. <BR> Touchweight
is affected on some notes where the spring is contacting the damper lever.
<BR> Hammer sometimes falls audibly into strings on slow release before
being pulled back by bridle tape. <BR><BR><B>Solutions: <BR></B> Replace
hammer flanges <BR> Replace cords <BR><BR><B>Condition of action:
<BR></B> If condition of the hammers, pinning, and travelling/mating to
strings is all good, replace cords. <BR> If pinning is poor then flange
replacement may be a better option. <BR> Beware of earlier type action
without butt plates - the following method would not work in this
case.<BR><BR><B>Cord Replacement Procedure:</B> <BR> 1.
Place action in cradle; remove hammer rest rail and treble bracket. <BR>
2. Reverse action so that hammers and dampers are facing you.
<BR> 3. Loosen hammer butt plate screws. <BR>
4. Remove hammer assemblies from flanges and let hang from
bridle wires; keep them in order to avoid tangling. <BR>
5. Straighten any bent return springs. <BR>
6. Tighten all wippen flange screws. <BR>
7. Tilt action toward you 90° so that the hammer flange cord
slots face upward. <BR> 8. Tighten remaining flange
screws.<BR> 9. Using specially adapted shimming chisel
or other suitable tool, clean slots (no solvent) and vacuum up debris.
<BR>10. Wrap 90+ turns on dowel with new cord and cut turns
with a razor. <BR>11. Glue one end of each piece to one slot
on each flange. <BR>12. Return to first flange and glue the
other ends to remaining slots; check with gauge. <BR>13.
Lubricate damper spring slots. <BR>14. Replace hammers;
tighten butt plate screws; hook springs under flange cords as you go.
<BR>15. Replace hammer rest rail bracket and reinstall rest
rail. <BR>16. Final check: jack springs engaged with jacks,
spring cords in crook of hammer return springs, bridal tapes not twisted.
<BR><BR><BR><B>Tools and Materials: <BR></B> __flange, thin-bladed, and
Phillips screwdrivers <BR> __spray lube and spring hook (for damper
springs) <BR> __shimming chisel modified to clean flange slots, or other
suitable tool<BR> __glue applicator (syringe) filled with Tightbond &
damp rag <BR> __action cradle <BR> __replacement cord, e.g., braided
Dacron of suitable diameter (kite string, parachute cord) or silk cord
(Pianotek)<BR> __9/16" dowel [turned down from 5/8" dowel] or suitable
width piece of cardboard<BR> __blunted scriber (or use small screwdriver,
to help place cords in slots)<BR> __gauge (dowel, sized to fit intact
flange cord, with end rounded off, to check loop size) <BR> __razor
<BR> __forceps <BR><BR>Many different types of cord will work. White
braided Dacron looks the best and will last forever. Joe Goss suggests Spider
Wire which I've bought but haven't tried yet. It's a similar color to the stuff
you're replacing so that tends to go against using it. I used to use squidding
line but the kind you'll likely find in fishing supply places is waterproofed
and wouldn't take well to Tightbond. Probably the easiest (and possibly
cheapest) is to order the silk action cord from Pianotek ($3.95 for a 30-yard
roll).<BR><BR>Cleaning out the slots is not critical and you could even give the
flanges a quickie scrub and vacuum treatment and commence with step 10.
<BR><BR>This method is taken from Tom Driscoll who posted it to the list in May,
2002 (Yamaha Upright Hammer Flanges). </BODY></HTML>