TP bushings: was pinblock hole alignment

[David Love]

The issue is not whether the holes are centered but whether the hole in the 
bushing lines up with the hole in the block.  Bushings are not always 
uniform and even if they were it only takes a slight error in marking to not 
have the hole in the bushings line up with the hole in the block.  If they 
don't, the pin can bear on the bushing rather than on the front side of the 
hole in the block and can effect tuning stability.  Better to drill through 
both insuring that the holes are aligned.

David Love

From: Wimblees@AOL.COM
>Reply-To: pianotech@ptg.org
>To: pianotech@ptg.org
>Subject: Re: TP bushings: was pinblock hole alignment
>Date: Thu, 10 May 2001 09:42:18 EDT
>
>In a message dated 5/9/01 3:35:19 PM Central Daylight Time,
>trouts_place@hotmail.com writes:
>
>
> > No doubt it's rather fool proof drilling in the piano.  But I've never 
>had a
> > problem drilling outside of the piano.  I would suppose the key is 
>making
> > good marks and following them.
> >
> > Best wishes,
> >
> > Brian Trout
> >
>
>I have always drilled the block out side the piano, and have never had a
>problem. As Brian said, if the block is tight against the plate, there is 
>no
>way it can be wrong.
>
>Perhaps the problem some other have is when they put the block in the 
>piano,
>and then put the plate in. When doing that, before attaching the block to 
>the
>piano, the block needs to be attached to the plate. Then I make sure the
>plate is in the correct position. As part of this process I put a slow 
>drying
>epoxy glue on the rim where the block sits. When I am sure the plate, with
>the block attached, is in the right place, I clamp the plate to the piano.
>After the epoxy has set up, usually overnight. I remove the plate and screw
>the block to the piano.
>
>Willem

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