[pianotech] Yamaha hammer spring cord jig

[Dean May]

I had to replace hammer spring cords on a Yamaha U1 and it did not have the
butt plates holding the hammers to center pin, so I was unable to use Jon
Page's protocol. Instead, after fighting with a few, I made this simple
fixture and share for your amusement and so Joe the Tool Captain can tell me
how I did it wrong. (just kidding, Joe)

	
	
  <file:///C:\Users\Dean\AppData\Local\Temp\msohtml1\01\clip_image001.jpg> 


I figured out my little flush trimming saw was perfect for cleaning out the
grooves. 

	
	
  <file:///C:\Users\Dean\AppData\Local\Temp\msohtml1\01\clip_image002.jpg> 


The jig is simply a nail near the edge of the work bench that I drop the
flange over. Using a trap work spring screwed to the bench next to it, I can
lift the spring and put its hole over the nail as well, trapping the flange
to the bench. 

	
	
  <file:///C:\Users\Dean\AppData\Local\Temp\msohtml1\01\clip_image003.jpg> 


I trap the first end of the new cord under the trap spring as well

I dab a tiny bit of thick CA into the grooves using my bulb syringe and then
line the cord into the left groove. There is a nail in the front of the work
bench as well that I wrap the cord around. Using tweezers I then pull it up
into the other groove, hold it firmly then spray some accelerator, wait a
few seconds, trim the excess and remove from the jig. 

It's ugly, but it works. 

 

-- 
Dean

Dean May                   812.235.5272  voice or text
PianoRebuilders.com   
Terre Haute IN  47802

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