Tining pin bushing purpose, was Xylol for tuning pin bushings

[David Nereson]

I thought bushings were inserted after the pinblock was drilled, and that
the hole was smaller than the pin diameter deliberately to give the pin a
little less tendency to flagpole.  I would think drilling the bushings
after insertion would almost defeat their intended purpose.
	--David Nereson, RPT

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]On
Behalf Of Frank Emerson
Sent: Saturday, March 31, 2007 6:00 AM
To: Pianotech List
Subject: Tining pin bushing purpose, was Xylol for tuning pin bushings

 > Mason & Hamlin said that one purpose of the bushings was to center the
 > drill bit in the plate's hole, so that would be one downside.
 >
 > --Cy--

Other piano manufacturers besides M & H  will tell you that the primary,
if
not the sole, purpose of tuning pin bushings is to center the drill in the
hole.  But, is that really optimal?  . . . . . <<