I have a customer with an old American grand piano. Someone "rebuilt" it sometime in the recent-ish past. The action is as slow as molasses. Upon inspection, it was clear that the action parts on the stack are quite free and all the excess friction is in the keys. None appear to be rubbing or otherwise interfering with anything. I think all the excess friction is in the key bushings. Without taking the action apart, what I could see of the keypins, they were corrosion-free. My visual inspection of the key bushings suggest they may be too thick. They appear to really be wrapped around the center rail keypins.
So I was planning on using my key bushing iron and ironing the bushings to free things up. Certainly I've done that before. But I don't know that I've ever tried doing that on a set of keys where perhaps the key bushings were not the correct size initially - they are too thick. So how much excess key bushing thickness can one iron out? Even if I can, will it last? Anyone with any experience with such a situation? Obviously, if ironing doesn't last, I can always propose replacing the key bushings with the correct thickness. But except for the family heirloom aspect of this piano (1914 Stark), I'm not sure it is worth a set of new key bushings...... :-(
Picture attached is not of the key bushings, but of the tuning pin coils on this beautifully "rebuilt" piano. Look and weep......
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Terry Farrell
Farrell Piano Service, Inc.
Brandon, Florida
terry@farrellpiano.com813-684-3505
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