Hi All,  Like Don Barton, I have also filed down numerous drive chucks
on the modern Aeolian players.  However, what I found is that old music
rolls played fine on the machine.  The ones that I had a problem with
were the new QRS rolls.  So, I measured the inside diameter of the hole
on the slotted end and found it to be 0.435".  Problem is, the drive
chuck is 0.440".  Checking a variety of other rolls, including old QRS
rolls, I found them all to be a relatively consistent 0.441".  Some were
right at 0.440", which is okay!

Point is, it's much easier to file the chuck 0.005"-0.007" than it is
to scrape away some of the plastic on the inside of the hole in the
flange.  (I smell another new web page about modern Aeolian players!)

Musically,
John A Tuttle
Player-Care.com
Brick, New Jersey, USA