Pete,  Regarding your rewind problem, I assume your roll frame is
the one with the 2:1 gearing on the top spool.  Couldn't you simply
exchange the two gears and leave everything else the same?  This would
slow down the rewind but give you four times the torque.  It would
slightly increase the back-torque on play but as long as there is no
current supplied to this motor during play it should be okay.

Good luck,
Nicholas Simons, GB

P.S.: You may, of course, need to make up a suitable sleeve or drill
out one of the gears.  I do not know whether they fit onto equal
diameter shafts.

 [ The inherent bearing friction of the upper gearmotor provides the
 [ hold-back torque on the supply spool during play mode.  Often a
 [ a felt front rail punching is fitted on the motor shaft as a brake,
 [ to provide a bit of torque adjustment.  But an ugly problem arises
 [ when the bronze bushings of the motor shaft bind slightly, which
 [ increases the hold back torque beyond the limited ability of the
 [ drive belts to pull the paper during play.  Installing ball bearings
 [ on the motor shaft solves the problem but adds expense.  -- Robbie