Frozen hammer rail screws

[Dave Nereson]

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  ----- Original Message -----=20
  From: Alan Forsyth=20
  To: Pianotech=20
  Sent: Sunday, June 01, 2003 3:18 PM
  Subject: Frozen hammer rail screws


  Paul Tizzard wrote,

  >>"Last week I assessed a piano at a local school that has all of the
  hammer rail screws "frozen" in the rail. The school is near the coast
  and the piano is in their hall. There is definitely a lot of moisture
  around generally. Does anyone have any suggestions on how to free the
  screws? I know heat is going to be involved, but what tools etc do you
  suggest? Are there any other possibilities? ">>>>

  Hello Paul,
  When you have heated the screws, give them a short sharp whack with =
the
  screwdriver inserted using a small hammer. This may break any bonding =
as
  well. After doing this, apply pressure with the screwdriver first =
clockwise
  as if you were trying to make it tighter, and then apply pressure
  anticlockwise. Keep going forwards and backwards like this until there =
are
  wider and wider movements of the screwhead. You will get a feel as to =
when
  the screw is turning in the wood as against the head just twisting. =
Also
  there is a product there called Wynne's Pry and Dry. Give those screws =
a
  liberal dousing before you start.
      (. . . . .
  Regards
  Alan Forsyth
  Edinburgh
  pianotech list info: https://www.moypiano.com/resources/#archives

      I suppose Wynne's Pry and Dry is a British product and we can't =
get it here in the U.S.  Anybody know an equivalent product we can get =
stateside?  I need something for those frozen let-off screws in old =
pianos.  I've tried heating.  They still break.  I've tried Protek.  =
They still break. =20
      --David Nereson, RPT, Denver


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