Here is just a quick thought in the old 65-note pianolas.  The vents in
the old 65-note bar is quite a bit bigger than a regular nine/inch
tracker-bar vents are.  Some, larger than others.

Of all the 88-note tracker bars I have seen, the old Aeolian seems
to have the smallest holes and Old Baldwin bars have the largest.
You might consider installing the Baldwin tracker bar on that unit.
Just a thought.

Best Regards
Andy & Chris Taylor
Tempola Music Rolls
http://home.swbell.net/tempola/index.htm

 [ Does the size of the tracker bar hole affect the air flow?
 [ I thought the hose was greatest influence.  -- Robbie