[ I sent to Flavio an image of the upright vertical action drawing
 [ reproduced on page 20 in the book by Art Reblitz, "Piano Tuning,
 [ Servicing and Rebuilding", 1st edition, so that he would know the
 [ English terms.  -- Robbie

Thank you very much for your answer, but my piano is simpler than
your drawing.  It is without keys, and there is a crank which turns
a big wood roller with a lot of pins (like a musical box, but bigger).

I know how were the hammers (I found one on the bottom of the piano).
They are similar to the part No. 5 of your drawing.  The hammer shank
is circa 3 mm diameter.

I haven't the parts connected at the hammer shank (which may be a part
of wood, with pins moved by the pins of the wood cylinder), the spring
which pushes hammer toward the string and the frame upon which swing
the hammers.

I made a model of all that but I'm not sure if the springs and the
frame are okay.  I don't know if the frame is a big piece of carved
wood, or if it is several pieces glued.  I don't know what kind of
wood, too.

Thank you very much,
with best greetings from foggy North Italy,

Flavio Pedrazzini

 [ Would somebody with experience repairing barrel pianos please
 [ contact Flavio and me?  I think that a few photographs will
 [ help him greatly.  -- Robbie