grand damper springs

[Stéphane Collin]

Hi list.
 
I wonder about a good system to regulate the damper levers springs in
turn-of-the-century pianos (the former century, I mean) which had springs
pushing on the levers.  Those springs seem inaccessible to me once the
damper under lever rail is installed in the piano.  And once installed, I
can see discrepancies in  those springs which I couldn’t see when the rail
was out.
Anyone more intelligent than I (no big deal) who has coped with this problem
?
 
Best regards.
 
Stéphane Collin.
 
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