John: Thanks for the information. The leather used in covering these hammers is a very soft, fuzzy kind of leather, unlike any leather I have seen used in pianos.The effect on the tone from this kind of leather is definitely not subtle! I will try carefully sanding them to remove the string cuts first before doing any hardening. I also wonder why the Austrians kept making these Viennese actions so long. When I first looked at the instrument I was expecting it to be a very well preserved example of a mid 1800's pianos. Patrick
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