key (1)
grasshopper or base (2)
fly or jack (3)
regulating screw and button (4)
underhammer (5)
hammer rail (with leather hammer hinges) (6)
hammer shank (7)
hammer head (8)
backcheck and "stay" (patented for squares by J. S. Broadwood, October 6, 1825) (9, 9b)
damper lever (10)
damper lift rail (11)
damper (12)
Source of parts names, Faust, Oliver C. The Piano Tuner's Pocket Companion, for Use of Pupils of the Faust School. Compiled From the Lectures of Oliver C. Faust. New York: C. N. Potter, 1899. (reprint) p.77
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