[pianotech] Expanding leads

[David Andersen]

We had a 1942 Hamburg B we rebuilt that had expanded lead in the back action ONLY. We drilled it out and replaced….had lived in South Africa for 60 years prior to SoCal….
DA


On Mar 13, 2013, at 7:04 AM, Dale Erwin <Erwinspiano at aol.com> wrote:

> David
>  I have a 1905 German O with spruce key wood that shows the leads to be slowly corroding and possibly expanding. In this country the N.Y.Stwy keys has always been made of Calif. sugar pine and I have not seen lead issues in this wood
> 
> Dale Erwin R.P.T.
> Erwin's Piano Restoration Inc.
> Mason & Hamlin/Steinway/U.S. pianos
> www.Erwinspiano.com
> Phone: 209-577-8397
> 
>  While I have run into expanding lead problems periodically generally they seem 
> to have been reserved for "lesser" pianos.  Today I found a 1950's Boesendorfer 
> 200 with leads expanding both in the back action and the keys to the extent that 
> they were binding on their neighbors and on the verge of splitting things.  Of 
> course I will have to remove and replace, a large task considering the new 
> weigh-off at the key end that will be required.
> 
> My question is what is it that causes that reaction and why after such a time 
> does it happen.  This is some 60 years later. 
> 
> 
> David Love
> www.davidlovepianos.com
> 
> 

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