Matt,
Do you have traditional wood tangents in hardwood keys? If so try pushing
in on the key while playing and then push down on the offending tangent and
see if the sound goes away. If it does you need to remake a tangent for the
hole or re drill the hole to the tiniest fraction of an inch larger. Sometimes
the holes begin to wear and taper, this taper allows the tangent to rock
back in the hole while you play. Much like the dog taps on the sound board it
causes the front of the tangent to tap on the key and make a high pitched
noise, it also affects the way that the string sounds.
Another fix for this could be to undercut the tangent a bit so that the
end of the tangent farthest from the post touches the key and taper the cut
farther up as it gets to the post. A 1/16 of an inch is good don't go crazy.
I know that this will get lots of comments but I have done a lot of
tangent work and this is usually the answer for the problem you are
describing.
Look carefully at the tangent as you put pressure on the string if it rocks
back in the slightest it can cause the high pitch. Sometimes its the hole and
not the tangent so look carefully at the whole thing before you start cutting
things up.
Scott
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