[pianotech] return spring

[Isaac Sadigursky]

Hi, Wim!
APSCO  used to sell those Shift Springs in 3 different strenghs ,3  
different gages of metal..
To make spring stronger:Just install Cardboard Front Rail Punching  
between the Spring and the Rim and it works..
Bending the spring weakens the Screw holes..
Just saw today Shimmed Shift spring on Yamaha C5.
spring becomes more effective when it is POLISHED and all of them need  
it.
3M light Deburring Wheel in shop or 0000 Steel Wool in the field does  
the trick.
Hope,it helps..
Isaac
On Aug 17, 2012, at 12:50 AM, tnrwim at aol.com wrote:

> Thanks for the advice on the tool. What I'm still looking for is  
> someone who has experience jumping on the spring. Or is it better  
> not to do that.
>
> Wim
>
> -----Original Message-----
> From: Ryan Sowers <tunerryan at gmail.com>
> To: pianotech <pianotech at ptg.org>
> Sent: Thu, Aug 16, 2012 6:58 pm
> Subject: Re: [pianotech] return spring
>
> This past year I broke one of those springs in an old Steinway  
> trying to weaken it with just my hands (I guess I don't know my own  
> strength!<G>) The good news was there was still enough of the  
> spring's screw holes left where I could attach half the spring to  
> the piano and it worked just right! Since then I bought a couple of  
> replacements and will put one in next time I see the piano.
>
> Here's is a couple of pictures that Kent Webb from Steinway sent me  
> of the factory tool for this purpose. I put the pictures up on my  
> website:
> http://pianova.net/media2/shiftspringtool.jpg
> http://pianova.net/media2/shiftspringtooldetail.jpg
>
> Ryan Sowers
>
> On Thu, Aug 16, 2012 at 5:00 AM, Tom Driscoll <tomtuner at verizon.net>  
> wrote:
> Wim,
>      I weakened a S and S return spring on a newish model B with a  
> very sophisticated tool.
>   Placing the spring on a piece of scrap wood on the clients garage  
> floor I whacked it flatter with a big ass hammer.
>    Two whacks ---  eight years ago and all is still well.
>  Tom Driscoll
> ----- Original Message -----
> From: tnrwim at aol.com
> To: pianotech at ptg.org
> Sent: Thursday, August 16, 2012 3:55 AM
> Subject: [pianotech] return spring
>
> I think I saw a tool that can reduce the tension of an action return  
> spring. I don't remember what it looks like, but it bends the steel.
>
> I wonder if anyone has ever tried to stand on the spring to do the  
> same thing?  Either stand on each end of the spring, or turn it  
> around and stand in the middle.
>
> Hey, I weigh 240 pounds. Isn't that enough to bend the spring?
>
> Wim
>
>
>
>
> -- 
> Ryan Sowers, RPT
> Puget Sound Chapter
> Olympia, WA
> www.pianova.net

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