Slow hammer return

[Arthur Chickering]

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List,
I have a customer with a 1921 Steinway Upright with very slow hammer =
return, which I think was caused by a floor humidifier.  I  heated the =
hammer butt centers with a hair dryer, which freed up the hammers for =
about 1 hour. The questions is what do you think is the most reliable =
way to free up sluggish hammers without replacing center pins or parts?  =
Should I use silicone and naptha, alcohol and methanol or install a =
Dammp-Chaser heater bar with a humidistat?

Thanks,
Arthur


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