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#2112477 - 07/03/13 10:45 PM agraffes?
berninicaco3 Offline
Full Member

Registered: 06/14/13
Posts: 103
Loc: iowa city, ia
Hi!

Just wanted to clarify.

I'm refurbishing my first piano, and have removed the old agraffes.
They are green with corrosion and flaking paint, which I will clean up.
The bores have the broken segments of rusted piano wire stuck in them.

Despite the above horror, I can of course give them a good cleaning. Push out the old wire, and gently debride the bores with a very fine round file that I have from my model-building hobby, and tumble the body of the agraffe or use a fine wire brush.

Is there anything more I should be aware of?
I heard from someone that agraffes can not be reused.

Something about how when they're installed, they really need to torque down at exactly the right angle.

If say, they torque down too far, and at the right angle, are sitting a fine hair above the surface of the plate, then do I solve this with shims?

Or just order new agraffes.

Which might be $150 for a set of ~50 (haven't got a clear answer on that one).

The main question is that when I place my order with schaff tomorrow, or friday morning if they're closed (probable), I want to cover all my bases rather than making repeat, little orders. So if I well and truly need new agraffes, then I need to order them. smile

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#2112493 - 07/03/13 11:19 PM Re: agraffes? [Re: berninicaco3]
Gene Nelson Offline
1000 Post Club Member

Registered: 09/10/04
Posts: 1548
Loc: Old Hangtown California
Nixon or Brasso will clean off the corrosion then polish with Flitz. You can purchase a roll of abrasive chord from Schaff that will help with the interior of the taper cut holes. The shape of the inside of the taper should resemble the edge of the Capo bar. Get off any burrs and smooth out the surface.
If you buy new ones be certain you get a set that matches yours: be careful of thread size and look close at all dimensions to include the distance between the holes especially in the bi-chord section as some may spaced wider than others - if you get this wrong you will have more problems with damper regulation.
When you install them it helps to run a string from the middle tuning pin to the adjacent hitch pin so that you have a reference for alignment - getting them at a 90 deg angle to the string plane.
Dont over-torque them into the seat, just snug. Fitting a new set you should have shims and a tool that can trim excess from the shoulders. Drill a hole in a piece of wood just over the size of the threads and glue on some 80 grit emery cloth.
A new set will save the cleaning and polishing work but the holes still may not be as smooth as you like and fitting them - compared to restoring a old set it could be about a draw.

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#2112722 - 07/04/13 10:24 AM Re: agraffes? [Re: berninicaco3]
woodfab Offline
Full Member

Registered: 12/06/05
Posts: 388
Loc: Stoneham, MA
I mount them on a piece of wood and use 5F5 Stripper with a soft wire brush to remove paint or coating.

I then clean them up a little more with a wire wheel.
Some people like to buff them, on this one I decided not to.

After mounting them back on the plate I give them a light coat of Lacquer.
_________________________
Dan (Piano Tinkerer)

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#2112898 - 07/04/13 04:21 PM Re: agraffes? [Re: berninicaco3]
Loren D Offline
2000 Post Club Member

Registered: 06/22/10
Posts: 2546
Loc: PA
I'd order new. Why risk a broken agraffe down the road? There's a lot of pressure on those things.
_________________________
DiGiorgi Piano Service (1984-2013)
http://www.digiorgipiano.com

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