Bridge pin angle

[David Love]

I've not really been following this discussion in all its detail so this
may be an already expressed opinion but here's what I see happening.
Under any conditions, with sufficiently angled bridge pin that is
unnotched, there is no way for the string to ride up the pin--period.
But as the bridge top expands and contracts the edge of the bridge
becomes indented more than the top of the bridge because of the
squeezing with changes in humidity against the bridge pin.  Now when the
bridge shrinks the line of the indentation at the edge of the bridge
will not be on the same plane as the top of the bridge.  Because of the
stiffness of the string and its tendency to want to stay on the plane
formed by the top of the bridge, the deeper indentation at the edge of
the bridge can cause a gap to form underneath the string at that point.
Tapping down the string will cause the string to move, but it is a
temporary measure.  The string will want to regain it's original shape
and position.  Over time, and not probably very much time, it will
unseat itself from the low indentation at the bridge edge reestablishing
the gap and giving the illusion of it riding up the pin.  Tapping down
may work for a short time, but it also probably exacerbates the problem
by further indenting the edge of the bridge.  Either way, the string is
not climbing the bridge pin and the better solution is to use some kind
of bridge top material or preparation that makes it less prone to
indentation.  Delignit material seems to be the hardest in use that I
know of, but does require a power notcher.

    
David Love
davidlovepianos@comcast.net