I have found a player stack I have never seen.  I wonder if anyone
has seen or rebuilt one.  It is made by Wright, according to Durrell
Armstrong's book.  It is to be found in a Marshall & Wendell upright.

The stack is the usual pneumatics on three decks, but hanging on the
front edge of the deck is a metal cylinder for each that has the pouch
and valve in it in an upright position.  Is this any more difficult to
restore than normal.  Nothing seems to be pot metal, but perhaps nickel
plated brass?  Another oddity is the board that covers the front of
the stack is merely a frame for a clear celluloid window.

Thanks for your comments

D. L. Bullock    Piano World    St. Louis