Bob, my experience is that string winders make strings to their convenience, not to the betterment of the piano. I kept wondering why the new bass string I installed sounded worse than the ones I took off. I then realized that string makers shorten the copper winding from 5/8" to 1.25 inches. Inharmonicity increases by the 4th power of the distance unwound. I charge the price of a tuning for rescaling a piano. I wound need the speaking length (in mm prefered) and the length of the tails from inner bridge pin to inner surface of the hitch pin in the bass. It may be necessary to put wound strings in the middle section to smooth out the curves. In order to control the string winding process I send a set winding specifications listing the core size, the wrap size the starting and ending points. This is the only way I have found that I get what I want. Newton
This PTG archive page provided courtesy of Moy Piano Service, LLC