brightening a Yamaha

[reggaepass at aol.com]

Hi Lists,

A client with a two year old Yamaha U1F complains that the C5-B5 octave 
is not as bright as the rest of the piano.  I listenened, and proposed 
to voice down the surrounding octaves.  He wants me to brighten up the 
octave in question instead.  I've never had to make a Yamaha brighter 
before.  I would probably be inclined toward some slight of hand if not 
for the fact that he sits there and watches the entire time I am 
working on his piano.

I cannot imagine juicing Yamaha hammers.  Is there another way to go 
other than filing the hammers in the C5-B5 octave?

Thanks,

Alan Eder
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