For most of their player grands, Wilcox & White placed their diaphragm
pouch stack, spoolbox and air motor above the keyboard (with extended
keyframe like Duo-Art).  I am looking for one of these actions (for
spare parts) but specifically with their late roll adjuster tracking
system that used a single pneumatic with a rotary valve to control same.
This was in use from mid-1917 on and was found on both their 88-note
player grands as well as the Artrio Angelus.

Thanks.
Dave Krall
djkrall@sbcglobal.net