List, Years ago, I decided to replace a set of those BIG balloon 14lb. hammers, on a full size upright, with 16lb modern pressed hammers. VERY LARGE MISTAKE! That piano played like a truck! And the centerpinning was extremely critical! The touch was very slow in response. Granted, the piano had a very big sound, (which is what the owner wanted), but repetition was markedly slower. I won't do that again! After about 6 months, the owner had me replace the hammers with 14lb and everything went back to normal. Of course, it no longer had that bombastic sound, but, at least it played "up to speed". FWIW Regards, Joe Garrett, (Oregon)
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