Major Grotrian problem

[Stéphane Collin]

Hello Ajay.

You could also check if the pre-hung hammers you got are hung at the 
right distance on the shanks.  A simple way to check this is to evaluate 
if the backchecks, when regulated albeit approximately, look like they 
have the usual 72° inclination with the key.  If they look closer to 90 
° (that is vertical), you can be sure that the hammers are hung at a too 
close distance of the center pin, and causing that weight problem.  Few 
millimeters are critical here.  Maybe the center pin to hammer distance 
has varied from time to time or from models to models.

Regards

Stéphane Collin.


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