This article is from the Piano Purchase and Maintenance FAQ, by Isako Hoshino rmmpfaq@yahoo.com with numerous contributions by others.
If you want to know all the technical details of how piano
works, there are two books published by Arthur A. Reblitz.
Reblitz, Arthur A. "Piano Servicing, Tuning & Rebuilding",
Second Edition, Vestal Press, Vestal, N.Y. 1994. $29.95.
Reblitz, Arthur A. "Player Piano Servicing and Rebuilding"
Reblitz Restorations Inc.
PO Box 7392
Colorado Springs, CO 80933
(719) 598-2538
(719) 598-9581 (fax)
Reblitz writes that: "there's no reason why anyone willing to
take some time to study its [the piano's] mechanisms can't
learn to repair and tune it well," and states that hobbyists
have even done fine piano rebuilding jobs. You just need
"persistence, common sense, and a bit of mechanical
aptitude", the proper tools, and a book like this one. The
books cover: the history of piano styles and construction;
the internal workings; evaluating an old piano for purchase
or repairing; how to clean a piano and perform minor repairs;
adjusting the action and pedals (regulating); and tuning
theory and procedure; and provides a 70 page discussion of
rebuilding. (Regarding rebuilding, the author does not
minimize the difficulties or skill requirements of this
undertaking.)
 
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