Recently, Diane and I rebuilt a Melville Clark Apollo Player Piano.
The piano was in excellent condition but when it was purchased it was
missing the stack.  Everything else was there.  We found a player piano
technician in Chicago that just happened to have an Apollo stack that,
with some retrofitting, we were able to fit into this piano.

This stack has a clock mechanism that runs the spool box.  The arm that
winds the clock spring is driven by a leather belt that is 1/4 to 5/16
inch thick by about 14 to 18 inches long.  It has to be threaded
through a pulley system so it is not a continuous belt.  We have had no
luck finding that size belt leather.  We used a size smaller (1/8 to
3/16 in.) and it didn't work because it stretched too much.

If anyone out there knows of a supplier who has this size leather
belts, please let us know or if you have any suggestions we would
welcome them.

Thanks,,

Wayne Johnston & Diane D'Tar