[CAUT] mystery solved

[David Love]

It depends on the plate angle.  On some you don't really need to, the force
of the string will bear pretty much straight down on the half round/oval at
90 degrees to the plate.  On others it will bearing will be slightly offset
and then pinning is necessary.  When I add a brass half round or oval to the
tenor section on most Steinways the angle seems just about right and I just
tack the brass with some 5 minute epoxy.  Similarly, the treble sections
don't seem to cause that much problem, especially if you are using half
ovals rather than half rounds.  On other pianos, like a couple of Knabes
where I've done this, pinning was definitely necessary.  

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Alan
McCoy
Sent: Monday, December 17, 2007 9:47 AM
To: College and University Technicians <caut at ptg.org>
Subject: Re: [CAUT] mystery solved

One thing I discovered this summer is that pinning these brass half-rounds
in place before stringing is a good idea. They will have a tendency to move
back (toward the keyboard) if left unpinned, especially when the duplex
angle is steep, which is the case on a 1977 M&H BB. Per Ron's suggestion I
pinned them with center pins.

Alan