Here are some Piano Technicians Journal articles that may be of help to you:
Rebuilding & Regulating the Viennese Action - Aug 1983, page 10
History of Early Viennese Pianos - Jun 1987, page 29
Late 18th century Viennese & German Piano Building - Sep 1987, page 36
Viennese Action Described - Oct 1976, page 11
Hope this helps.
Ted Simmons, Merritt Island, FL
>I've been servicing an 1860 Bosendorfer that now needs some regulation.
>Does anyone know where I can get a manual or specs on Viennese actions?
This PTG archive page provided courtesy of Moy Piano Service, LLC