Pinblocks, CA & Dope - an update

[Andrew & Rebeca Anderson]

---------------------- multipart/alternative attachment
Terry,
I just went back to tune a old upright piano today that I had treated with 
CA via syringe with the piano standing up, there was little room for laying 
it down.  I had the same problem with the deep bass rapidly swinging the 
tuning hammer back as soon as I let go of it.  I followed the treatment 
with a pitch-raise.  I did the upper first and then came back down to the 
pins I had treated.
The second time around I lowered the pitch first in case any CA had made it 
down to the pins on the plate just below the tuning pins.  There was a 
definite feel of "breaking loose".  I was worried about that but the torque 
staid good for this, the second tuning.  More loose pins have turned up in 
the treble as well as a lot of false beats in the killer octave.  I tried 
leveling the strings below the pressure bar but that didn't make much 
difference so I'll be looking at CAing the pins on the bridge, maybe; 
removing the strings first from them might not fit their budget.  Has a lot 
of loose center pins too, flat and grooved hammers etc. just have to 
convince them to buy a new piano.

Andrew

At 09:51 AM 3/8/2004 -0500, you wrote:
>FYI:
>
>I CA-treated the pinblock of an old upright six months ago. Dozens of pins 
>were so loose that they immediately spun back on their own after raising 
>the pitch. I tipped the piano back and applied two bottles of thin CA 
>(after spending 20 minutes trying to talk the lady into dumping the 
>piano). It was quite apparent that the pins had been doped some years ago 
>- plate was all stained at the tuning pins and the feel of the few pins 
>that had any torque was very spongy. The CA treatment seems to work well a 
>couple days later when I pitch-raised and tuned the piano.
>
>I went back there last night to tune. Three pins had let go. I gave them a 
>tap or two and they then had a very solid feel. All the other tuning pins 
>had good to great torque and very good feel.
>
>This piano had a full plate with no tuning pin bushings.
>
>Bottom line: CA worked great on this previously doped block. Your results 
>may vary.
>
>Terry Farrell

---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/84/89/0d/5e/attachment.htm

---------------------- multipart/alternative attachment--