<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Schwander return spring loops</title></head><body> <div>Having done three in the last month, here's my latest updated procedure.</div> <div><br></div> <div>the cord is available from the supply houses or use what others recommend.</div> <div><br></div> <div><font face="Abadi MT Condensed Light" size="-1" color="#000000"><b>Yamaha vertical flange cord replacement procedure<br> <br> </b>Decide if repining is in order before removing hammers from rail.<br> <br> Apply a CLP to the bridle wire ends and remove the straps.<br> <br> Remove the hammer rest rail treble pivot arm (only) and remove the rail by sliding<br> it towards the treble. Remove the Let Off rails. With the rails out of the way disassembly<br> and  reassembly are much easier, the jacks slip forwards unencumbered.<br> <br> Remove the hammers/flanges, place on holding tray, number each and separate.<br> Be careful not to press down on the wippens causing the damper spoon to bend.<br> <br> File the hammers on an oscillating spindle or drum sander. Trying to mate old string cuts<br> in the hammers to the strings during reassembly is not recommended.<br> Optional: taper hammers; right side bass, left side tenor, both sides treble.<br> <br> 44 mm cord length: wrap the cord around a 14 mm or 9/16" dowel or some other material of such a dimension to get 44 mm when the cord is sliced along the length of the wrappings.<br> <br> Secure each flange in a vise to clean the grooves (a hacksaw blade works well), do the set.<br> Glue cord end 10 mm onto one side of the flange, entire set. The glue will be set to install<br> the other side from the beginning. Use PVC-E or some other white glue. Repin if needed.<br> <br> Before the flanges are reconnected it's a good time to apply Teflon powder to the butts in groupings. Reassemble butts and flanges.<br> <br> While the hammers are out, lube the damper spring punching. Adjust damper spacing and pedal lift. It's also a good time to adjust damper and jack spring tension if you're so inclined.<br> <br> Install hammers, space to the unisons, travel as needed; space strings as needed.<br> Install Let Off rail, hammer rest rail and reconnect bridle straps.<br> <br> Spring tension: 40 grams measured at the spring is roughly equivalent to 20 grams measured at the flange. The angle between the arms is around 90 degrees.<br> <br> Another procedure can be found here: (see photo at end):<br> </font><font face="Abadi MT Condensed Light" size="-1" color="#004AF1"><u >https://www.moypiano.com/ptg/pianotech.php/2006-December/198869.html</u></font ><br> <font face="Abadi MT Condensed Light" size="-1" color="#004AF1"><u></u></font></div> <x-sigsep><pre>-- </pre></x-sigsep> <div><br></div> <div>Regards,<br> </div> <div>Jon Page</div> <div><br></div> <div>PS My saw blade is mounted between two wooden slats (RennerUSA)</div> <div>and protrudes the appropriate distance for quick slot cleaning.</div> </body> </html>