Grand touch

[Byeway222 at aol.com]

Hello List,
It has been fascinating reading the posts on inertia, initially sparked off  
by my original posting on the Petrof action I am dealing with.   Unfortunately 
I still don't have any further clarification as to whether inertia  is the 
problem.  I have been back to the piano and checked certain areas  which I had 
not previously been able to do.  If I could reiterate, the  situation is:-
 
A Renner action in a 12 year old Petrof concert grand which feels heavy and  
tiring to pianists.
The D/W  average is 48g and U/W average 28g. Action ratio around  5.5
The regulation is not perfect but is good.
The damper pick up point is right.
The keys are not binding at the balance point or at the capstan.
The key weighting goes from 3 half inch weights in the bass through a  
(curious) tenor octave of 4, then to 2 and 1.  Obviously, the positioning  of 
weights is crucial but without photos I can only describe the  positioning as not 
looking unusual in any way.
I noticed that the whippens are the Renner design to take a helper  spring.  
I don't see evidence though, that a set of springs or looped  flanges has been 
removed. They are usually just unhooked if a technician decides  against them.
 
So, given that friction does not appear to be a problem in the general feel  
of the action, what would be your next steps in solving the problem.
 
ric
 
 
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