In reply to Eddie's question, the size of the middle three boards of the
Accordion Pneumatic are all 3/8".  I assume the book tells you how to
make the four wooden spacers used to recover the accordion, if not just
ask.  Is your Duo-Art a full or half pedal system?  I have just converted
a half one to a full one by joining two boxes together and it makes a
BIG difference to the sound of the rolls

Peter