Flange Center Friction Increase

[Scott Jackson]

No matter how 'gently' i try, i have never been able to put a cut centre pin back in a bushing without knocking out the cloth! I would not recommend trying this to anyone (unless they really want practise at re-bushing flanges!).

Scott Jackson
Australia

----- Original Message ----- 
From: "Paul Chick (Earthlink)" <tune4@earthlink.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Saturday, July 19, 2003 10:07 AM
Subject: RE: Flange Center Friction Increase


| Terry
| Isaac Sadisgursky talked about this in his class on center pins at the
| Convention.  He demonstrated how a center pin can be too tight in the
| bushing cloth and loose through the wood, just the opposite of what it
| should be.  This problem can be spotted as you describe--fewer swings as you
| go along.  Here's his test: carefully remove the center pin from an
| offending flange. Gently place it back in the bushed flange and check the
| friction just by pushing the pin with your fingernail. Now place the same
| pin in the wood and push it with your fingernail.  Chances are you can push
| it right through the wood.  The problem is caused by using the assembly wire
| used in the flange to size the bushing cloth during manufacturing.  When the
| flange is installed, the worker slides the wire back to clear the other
| member then slides it through and cuts it to length, fitting done.  Isaac
| says to watch for centers that are clipped on both sides of the flange.
| This will tell you a wire had been used.  He then went on to demonstrate how
| to repin a set of flanges in about 45 minutes.
| Paul C