Bob, I love the Tokiwa felts sets.? On the trichords, they did not work well at first.? I discovered that increasing the cut in the middle made them work perfectly.? A single edge razor did the trick.? Turn the damper upside down and push the razor directly in the cut, and increase the cut depth by about a 1/16.
On my B, which was made in 1917, still has the original back action.? I cut the springs out completely.? I don't think the springs are the problem.
Denis
-----Original Message-----
From: Bob Hull <hullfam5 at yahoo.com>
To: caut at ptg.org
Sent: Fri, Aug 21, 2009 2:18 pm
Subject: [CAUT] Underlever Felt
I am working on the new set of dampers on a Baldwin SD-10 and having problems
getting them to silence completely. I found a broken damper underlever flange
and had to pull it out. I took a look at the felt wedge that holds the spring
in place - the spring that pushes the underlever back down. Inside of that
felt wedge was a black mess of something - old lube I suppose that had perhaps
collected dirt - I wondered if this might be gumming up the work of that spring
and slowing down the underlever? To clean it, I think I would have to pull the
entire back action, put new felt wedges on and clean the springs. Big job. I
used protek on all of the underlever flanges.
Also, I used Tokiwa felt and the damping is insufficient in a rather wholesale
manner. I have tried to follow every normal procedure. The tenor dampers
especially have an over-ring (almost like a harmonic) sound that doesn't seem
related to sympathetic vibrations of other strings because as soon as I touch
the string I played - it stops. Is the Tokiwa felt dense/soft enough? I have
even tried substituing flats in the back instead of wedge - and got a tiny bit
of improvement but not enough.
Any ideas are appreciated.
Bob Hull
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