Bridge Repair

[Richard Moody]

----- Original Message -----
From: Avery Todd <avery@ev1.net>
To: <pianotech@ptg.org>
Sent: Wednesday, May 03, 2000 6:13 PM
Subject: Re: Bridge Repair


> Newton,
>
>     I guess I missed the post that your reply refers to. Could you, or
> anyone else, expound some on the longevity of CA glue used in the
> pin block as a tightener? I don't even know how long this has been
> done, so I'm curious. Anyone have years or experience using this?
> Thanks.
>
> Avery
>
Avery,
    I have experimented with CA on three pianos here, and a couple in
clients homes.  It does seem to hold.  Unfortunatly I don't get called back
to know how it works in the field, and the pianos here I am ruthless as far
as testing.  For instance if you have loose bass pins and use CA and then
down the road have to loosen the strings to make bridge repairs, then I
think   the CA works less after you bring them back up.  It seems like it
would hold less after you had to raise to pitch.  That the CA adheres to the
pin and also pinblock material and turning the pin might be like turning a
rasp in the hole.  I suppose one could turn out a pin that had been CA'd and
see for him/herself if CA makes the pin rough in the block.
Also I don't see how CA gets past the plate bushing and reaches the
pinblock.   I have that question for conventional TP tighteners as well.
So I will experiment with a small hole drilled in the bushing on the "top
side" of the pin.  So as always with technicians, it is test test test,
record your results.

    I am wondering of anyone has used it on "jumpy" pins. ?  I would like to
try that but fortunatly I haven't come across that lately.    ---ric

ps  With out CA in my kit, I am risking not being able to make more than a
few repairs that were impossible to do on site before this stuff was
invented.