Below is a picture taken May 1996 at a Piano Technicians Guild Regional Seminar where I demonstrated the "CCPPT."  The aluminum frame erected over the piano had a crane-like trolley car on a track at the top of the frame - in the picture behind the big banner.  Suspended from the trolley is the stepper motor and gear reducer (in blue - just to the right of my left hand.  The output shaft of the gear reducer connected directly to the socket that engaged the tuning pin on the piano. The apparatus did work at this Seminar, but it was pretty unwieldy, and the ambient noise in the room interfered with acquiring a good signal from the struck piano note.  Also, the motor added to the noise.  These problems led to the development of the motor being located via a flexible shaft away from the piano.

See revised version.