Some time ago I asked about four rolls I have that have a square hole
rather than slotted end.  Someone kindly let me know that those rolls
went to an early Apollo push up player.  I now have just such a player.
It is an spring wound Apolloette from 1904.  It plays 58-note rolls and
has the square chuck.  I haven't checked whether it would fit any other
rolls regardless of the spool end shape, yet.

Does anyone have any of these 58-note, square drive chuck end rolls
available for sale?

I would be interested in buying any or all of them.

D.L. Bullock    Piano World    St. Louis