To Danny Dover, and others interested: I have never seen a broken plate in a Hamilton, but did encounter one in a Baldwin 40" Acrosonic in about 1975. The piano had been built about 1964 and its 10-year warranty had just expired. The folks at Baldwin, with which company I had a close relationship at the time, graciously rebuilt the piano, installing a new plate. The only cost to the customer was the transportation; even that was minor since the piano went on the Baldwin truck when it made its regular rounds to the local dealer. I wouldn't expect the same response from Baldwin in your situation: much older piano, etc. But my guess is that the current Hamilton plate castings are interchangeable with the 30-year-old one. Should be an interesting project! Good luck! - Tom McNeil - Vermont Piano Restorations
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