replacement hammer butt springs

[Richard Cromwell]

I was told that the felt was moth-proofed, and whatever they used over years
would have a corrosive effect. 

I replaced a set of hammer-butt return springs and rail felt about a month
ago on a 70's Currier console.  When I came to the instrument the few
springs that were left unbroken basically disintegrated when touched.

R. Cromwell
Detroit-Windsor Chapter

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf
Of gordon stelter
Sent: Thursday, August 05, 2004 9:45 PM
To: Pianotech
Subject: Re: replacement hammer butt springs

Why not do a litmus test on a  punching and determine
its PH?
     Thump

--- Farrell <mfarrel2@tampabay.rr.com> wrote:

> Funny you should mention bad felt John. Just last
> week I spent a day doing some refurbishing on an old
> original M&H upright from the 1890s - quite
> respectable shape for its age. I was putting all new
> felt on the keyframe and leveling keys, but the lady
> wanted to minimize costs, so the key bushings were
> OK and I figured I would not do anything with the
> keypins. Upon removal of the center rail pin
> punchings, I noticed that the center rail keypins
> were all corroded just at the bottom where the felt
> punchings were. The front key pins were fine - no
> corrosion. But the center rail pins were trashed - I
> had to replace them. Bottom line though, I can only
> assume the two rails had been exposed to similar
> environmental conditions for the past 110 years, but
> only the center rail pins corroded - likely the felt
> punchings I presume? I wonder what it could be about
> the felt that would cause corrosion like that.
> 
> Terry Farrell
>   ----- Original Message ----- 
>   From: John Ross 
>   To: Pianotech 
>   Sent: Thursday, August 05, 2004 8:23 PM
>   Subject: Re: replacement hammer butt springs
> 
> 
>   Hi Elwood,
>   I suppose those repair springs might be ok, in an
> emergency.
>   But, I would recommend, installing the proper new
> springs on the rail. If some are bad, the rest are
> on the way.
>   If you do replace the springs, make sure to
> remove, any felt that might be there. Impurities in
> the felt, was what caused the problem, in a lot of
> pianos from the late 70's and 80's
>   Regards,
>   John M. Ross
>   Windsor, Nova Scotia, Canada
>   jrpiano@win.eastlink.ca
>     ----- Original Message ----- 
>     From: Elwood Doss, Jr. 
>     To: Pianotech List 
>     Sent: Thursday, August 05, 2004 8:48 PM
>     Subject: replacement hammer butt springs
> 
> 
>     Anyone have any good ideas regarding installing
> repair hammer butt springs in an Acrosonic spinet? 
> I have the kind of springs that has a flat plate
> (really small) with a slot in it for placing a screw
> in it.  Anyone tried using thick CA glue or that new
> "gorilla glue" to attach it to the hammer butt
> spring rail?  Just wondered.
>     Joy!
>     Elwood 
> 
>     Elwood Doss, Jr., RPT
>     Piano Technician/Technical Director
>     Department of Music
>     145 Fine Arts Building
>     University of Tennessee at Martin
>     Martin, TN  38238
>     731-881-1852



		
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