This page allows access to a video in which you can view the process of tuning by hand manipulating the worm gear box input shaft.. In conjunction with this method is the use of Tune Lab software running on a notebook PC. This software handles the data acquisition of the piano note being struck and displays the data on the PC screen. By hand adjusting the tuning mechanism, the desired pitch is achieved by observing the PC display.
Note that the sound of the piano in this compressed video format has a very tiny sound. The uncompressed video has a clear sound. Please mentally compensate for this distorted sound when watching/listening to the video.
(The download took 40 seconds on my cable Internet access.)
You will need a free version of Quick Time viewer.