[pianotech] CA pinblock with tight bushings?

[Dean May]

 >>Anyone out there had similar experience and tried drilling down through
the bushing?

No, but we expect a detailed lab report with before and after torque
readings. A spread sheet analysis would be fine. :-)

I've found that turning the pin back and forth about 45 degrees at a time
while applying the CA aids in allowing it to wick a little deeper. Often
there are fewer than a dozen really problem pins this needs to be done to,
the rest respond adequately without it. 

The other thing you can do is flip the piano and apply CA to the bottom of
the tuning pin holes. Remove the action, lid, lid hinges from the rim, and
flip it upside down. It is a pretty effective treatment as the hole provides
a well you can put quite a bit of glue in to let it soak deeply. Be sure to
spritz everything with some accelerator before setting it upright to keep
any uncured glue from running out of the holes into places you don't want
it. I've heard that can happen...


Dean

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Mike Spalding
Sent: Monday, February 14, 2011 10:33 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] CA pinblock with tight bushings?

I should have mentioned in my original post, I have done a lot of CA
juicing, including pianos like this one with tight bushings and loose
blocks.  Bushings are no problem if the pin is so loose that string tension
has pulled it away from the bushing on one side - then you can easily flow
enough CA down to the block.  The procedure is noticeably less effective
when there is no gap between the pin and the bushings, sometimes not
effective at all.  Meaning, you can tell by the feel of the pin that it is
only being gripped by the bushing, not the block.  No pin wind-up, telling
you it is gripped only at the top, not down in the block, and once it begins
to turn it spins freely.  Anyone out there had similar experience and tried
drilling down through the bushing?

thanks

Mike

On 2/14/2011 9:22 AM, Cy Shuster wrote:
> I use the thinnest CA and a veterinary hypo needle. I don't even bother to
tilt uprights anymore, because it wicks in so readily. Try it without
drilling.
>
> --Cy--
>
> Cy Shuster, RPT
> Albuquerque, NM
>
> www.shusterpiano.com
> www.facebook.com/shusterpiano
>
> On Feb 14, 2011, at 8:08 AM, Mike Spalding wrote:
>
>> List,
>>
>> During a recent thread on CA for pinblocks, someone mentioned the idea of
drilling a small hole down through each bushing to improve the flow of CA to
the block.  I believe this person had not tried it yet, but was considering
it.  I have a situation (newish Asian grand, tight bushings, loose block)
where this might be the only way to get the CA where it belongs.  Has anyone
tried this technique, and if so, with what results?
>>
>> thanks
>>
>> Mike