[pianotech] Knabe knapstans

[Chuck Vetter]

Keith,
After some add'l trial, I am able to get most out without breakage......and 
will lube to go back in. But, don't know if a quick pass with a drill to 
ease the hole might help. Very brittle brass.......I thought the old stuff 
was the good stuff. Reminds of the strength of the screws used to hold the 
pedal props on a Chinese grand.
C
----- Original Message ----- 
From: "Mr. Mac's" <tune-repair at allegiance.tv>
To: <pianotech at ptg.org>
Sent: Wednesday, January 19, 2011 1:30 PM
Subject: Re: [pianotech] Knabe knapstans


Chuck,

I don't understand "turn them out and swedge the hole".

Usually when I come across an apparent immovable item such as you have,
   especially after one breaks. That is a clear warning sign of potentially 
more to come.
I tweak the apparent immovable item ever so slightly in both directions, 
over and over,
   until I see evidence of movement.
In most cases the item will free itself enough to adjust or remove.

I'd go with the heat idea of Ron's in conjunction with the tweaking idea I 
mention.
If breakage still occurs, you have some work cut out for you.

You then could experiment with various lubricants, but seems an unlikely 
approach.
   for something already steadfast.

Keith

On Jan 19, 2011, at 1:06 PM, Chuck Vetter wrote:

> … I was aslo going to turn them out and swedge the hole then re-insert. 
> Thoughts?