[pianotech] CA pinblock with tight bushings? (too much CA is possible)

[johnparham at piano88.com]

Keep in mind that too much CA can create a negative situation as well. 
On my grand at home I now have a dozen tuning pins that sound .22 cal.
pistols on a shooting range every time I tune it.  

Common sense applies here as well.

-John Parham

> -------- Original Message --------
> Subject: Re: [pianotech] CA pinblock with tight bushings?
> From: "Dean May" <deanmay at pianorebuilders.com>
> Date: Mon, February 14, 2011 1:21 pm
> To: <pianotech at ptg.org>
> 
> 
> >>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