[pianotech] sluggish jacks

[John Ross]

I remember someone saying that Renner bushing cloth was graphited. 
I do remember some prepared Renner bushing cloth that I got at conventions, was graphited.
I never had a problem, but some people apparently had sluggish problems, that got worse the more it was played.
If it were graphited bushing cloth, perhaps there was an interaction with the lubricant used.
So be sure to check before repinning.
John Ross
Windsor, Nova Scotia.
On 2011-07-13, at 8:14 PM, David Weiss wrote:

> List,  
> 
> I received a call to look at a Baldwin baby grand with sluggish action.  The
> piano was rebuilt about 10 years ago, with Renner parts.  A Dampp Chaser
> system was installed at the time of the rebuild.  
> 
> About 6 months ago the owner noticed about one octave of sluggish notes.  He
> called another technician who came out and lubricated the jack flanges.  It
> didn't help and more notes started getting sluggish.  He called the other
> tech back, who lubricated again.  The owner said after the second round of
> lubricating the problem was even worse.  I don't know what the other tech
> used to lubricate, but I'm assuming it was Protec.  
> 
> I looked at the action today and the jack flanges are really tight.  Some
> notes will play once, other notes will not even play one time, the jack
> being stuck in the forward position.  All the other flanges in the action
> are fine.  
> 
> I'm trying to figure out why this happened.  The house is modern with
> reasonably good climate control.  They heat and cool like most people in my
> area.  They don't leave windows open a lot.  There have been no unusual
> events, such as burst pipes, broken air conditioners, etc.  The piano has
> been in the same spot for 10 years, and seems to have been fine for the
> first 9 years.    
> 
> I gave the owner a quote for re-pinning the jack flanges.  But two questions
> linger.  If I re-pin, will the problem re-occur; and why did this happen in
> the first place.
> 
> Thanks for your input,
> 
> David Weiss
> 
> 

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