kneading hammers

[Rupert Williams]

Please could someone give some advice on exactly how
to go about kneading hammers as suggested by Alfred
Howe in his book on Scientific Piano Tuning and
Servicing (1947)?

He mentions gas pliers, and kneading in alternate
directions. Others on this group have in the past
explained how they have used vice-grips.  

I would like to know exactly where to apply the
pressure, and how much pressure to apply.  Should the
felt thickness be reduced by 1/2 or some other
fraction?

Can the felt be permanently damaged?  Is it inherently
more harmful than needling?

Thanks for any tips.

Rupert



 
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