v-bar/capo repair: Seiler pictures 2

[Overs Pianos]

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Hi Barbara,

I agree with David and Ron N, I think the front duplex length is one 
of the main issues. There is also a degree of capo bar deformation 
which won't be helping matters either.

Hardening the bar along with reducing the duplex length would most 
likely help. However, the string approach angle is getting up there 
to be running against hard bars and the last note before the bar has 
quite an offset angle over the bar. So if this bar is hardened you 
will have difficulty avoiding the tendency for the fist capo-note 
strings to skid across towards the adjacent treble strings (this is 
not uncommon when the bars are hardened). This tells you something 
about soft capo bars, they are grooving, and the grooves are holding 
the strings in the position they were aligned to. It stands to reason 
that the piano wire will be rattling on the deformed groove as it 
vibrates. Hard hammers will bring out the worst that is there to be 
had.

You could experiment with front duplex length reduction by selecting 
the note with the most offensive string noise, placing a small bar 
under the string as close as possible to the capo. The transformation 
will very likely astound you. Its unfortunate that S&S persist in 
using 40 mm as a front duplex standard for the first capo notes. By 
default a great majority of the rest follow suit. When copying some 
one else's specification, it helps to understand what it is we are 
copying.

Surely we can learn something by observing the fact that string noise 
in upright pianos is just about non existent. I believe it is no 
coincidence that upright pianos don't have 40 mm between the V bar 
and pressure bar. If they did they'd be noisy also.

Just as an aside, that plate is conveniently shaped for retrofitting 
a strut between the plate and the belly rail. Often the lower corner, 
where the plate strut meets the agraffe mounting plate, is radiused 
making it hard to centre-drill the plate for seating the strut.

For those of you who haven't seen the struts that we fit between the 
plate and the belly rail I've posted an image to my personal web 
space. Its a bit big to post to the list.

http://members.optusnet.com.au/ronovers/hardened_KG6_capo.jpg

This plate has the characteristic inconvenient radius right where we 
would prefer to locate the strut.

Best,
Ron O.
-- 
OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
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Web http://overspianos.com.au
mailto:ron@overspianos.com.au
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