split bridge

[David Love]

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Joe:

Why would you not clamp epoxy?  The bridge needs to be pulled back =
together, among other reasons, to get the pins back in the right =
position.  My conversation this date with Roger Weisensteiner confirmed =
my belief that this would be the method of choice for making this =
repair.  He suggested using a two part epoxy (e.g. West System type) and =
clamp it back together reinserting the pins either before or after it =
dried.  My concern with after is that if I have to redrill the case =
might be in the way.  So I will probably reinsert the pins before it =
dries.

Regarding solvents and epoxy, I have, in the past, repinned bridges =
putting a drop or two of epoxy in the bottom of the bridge pin hole =
prior to inserting the pin.  The squeeze out I have cleaned up by =
brushing it onto the notch using an acid brush with a bit of lacquer =
thinner.   I think I may have been introduced to this technique by Bill =
Spurlock in a Journal article in fact.  Though I recognize the =
controversy surrounding epoxying bridge pins in, I wasn't aware that a =
bit of lacquer thinner was compromising the strength of the epoxy. =20

David Love
  ----- Original Message -----=20
  From: Joseph Garrett=20
  To: pianotech@ptg.org=20
  Sent: August 31, 2001 5:47 PM
  Subject: Re: split bridge


  David,
  It is not adviseable to "clamp" epoxy. Use a gap filling type and just =
let it set to almost, then clean up by scraping, etc. Also not =
adviseable to use the compatible solvent, of which there are two, (there =
may be more), Alcohol and lacquer thinner are verboten, it will simply =
break down the strenght of the epoxy. I personally use "steel epoxy" for =
this kind of repair.
  regards,
  Joe Garrett
    ----- Original Message -----=20
    From: David Love=20
    To: Pianotech=20
    Sent: Friday, August 31, 2001 10:07 AM
    Subject: split bridge


    I have a customer with a Boesendorfer 225 c 1978.  The bridge is =
splitting along the speaking side pin line on the top 5-6 notes.  I'm =
not sure how long it has been this way, this is the first time I've seen =
the piano.  My intention is to remove strings from this area, work epoxy =
into the crack, pull it all back together with clamps and clean off the =
excess with a bit of lacquer thinner.  Any comments.

    David Love

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