Hello John: The Action you are referring too is indeed a Wood-Brooks 90 degree action. These actions were found mostly in Story&Clark and Everett Pianos. However they were also used in other pianos. In 1947 or 1948 The store that I worked at bought these actions in "Shoninger" pianos. At that time I was young and brain-washable and thought factories technicians knew all and would always tell the truth. So I believed them when they said that the W-D 90 action was God, s gift to upright pianos. You can guess the rest. Their weakness seemed to be let-off and check. I think if this action had been bigger in would have worked. Then to have make it a true double repeating action would have been a fairly simple matter. Other than this effort The Wood- Brooks built very good actions. The most popular was the SIS model found in Wurlitzer and other Spinets. And you have to give them credit for trying something new with the W-D-90. They must have spent a lot of money developing this action. In the 1970 June and July issues of the PTG Journal you will find an article on regulation of this action written by John Galt who was our Technical Editor at that time. The PTG Foundation will be displaying a model of this action in the " Tidewater " room on the second floor at our National Convention in July. Hope this helps, Jack Wyatt
This PTG archive page provided courtesy of Moy Piano Service, LLC