[CAUT] install bridge pins?

[David Love]

I'm not convinced that the epoxy penetrates any more than the CA.  If the
bridge cap is coming apart I recap and don't presume to fix it with epoxy
penetration.  I've not tried to measure the penetration with CA so I can't
comment there.  Treating with epoxy or CA allows me to redrill the holes as
both work well to reinforce the wood around the hole so that it doesn't chip
or split during the process of redrilling.  If you are going to redrill you
have to do that first.   I've not had problems with broken bits when
redrilling (unless you hit a screw).  Denatured alcohol is the solvent that
you use to thin DAG and it does work to remove it.  Make sure you clean it
off before you do anything to the notches.  Then any residue you leave there
will be cut away when you renotch.  You can also scrape the dag off but be
careful that you don't create dips in the bridge cap.  A razorblade works
fine and will do less damage than a scraper.  Yes, agraffes and capo bar
dressing are also an important part of the equation.  

 

David Love

www.davidlovepianos.com

 

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Mark
Cramer
Sent: Monday, April 20, 2009 7:37 PM
To: caut at ptg.org
Subject: Re: [CAUT] install bridge pins?

 

David, one more question. and a couple comments below, s.v.p.

 

I don't do the epoxy method anymore either. 

 

Why CA? 

 

Do you feel it penetrates as well, or better than saturating epoxy? I've
tried adding a dye tracer to CA to track its penetration, but if I recall,
it made the CA cure before it could penetrate. 

 

Can you make a guess, or share an observation on how deep it penetrates into
the wall of the bridge pin holes? At least .010" I gather, if you're
up-sizing the hole afterward? 

 

When we have a minute, maybe I'll do a sample piece of cap-stock, then
re-saw it and have a look inside.  

 

Does it have a similar indifference to moisture as epoxy? 

 

No problem with breaking bits when re-sizing?

 

cleaning the old dag off with denatured alcohol  

 

Thanks for that tip!

 

Resurfacing the bridge, repining and recutting the notches is an essential
part of any quality rebuilding job, in my view.  

 

Agreed, along with service to the capo and agraffes.

 

Best regards,

Mark Cramer, RPT

Brandon University

 

 

 

 

 

     

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/caut_ptg.org/attachments/20090420/9f9fe341/attachment.html>