I would like to add a few notes to Jeffrey Wood's article:

> 5. Tracker ears in bar with adjusting screws.  The roll wanders
> wherever it pleases with the tracker bar following it.

The various roll makers over the years used different kinds of paper
and cut it to slightly different widths.  They also used different spool
manufacturers.  This modification (unnecessary when the gods at Aeolian
were making rolls) allows for instant adjustment as the roll begins,
and nothing original is compromised:

Simply, if the ears through the tracker-bar are replaced with modern
brass screws with the tops ground flat and into a point on one end (an
arrow -- pointing up), then it's easy to adjust with thumb and finger.

I've done this with all of my Duo-Arts.  If the bottom end of the screw
(where it contacts the tracker-ear) is ground ovate, the turn-to-adjust
will be less than half a turn and can be easily accomplished during the
first few notes.  No hunting for a screwdriver.

Not all of these "ears-through-the-bar" models had floating tracker-bars.
On the floaters, it is quite possible that the paper can wander far
enough to feather and rip the edges.  When rebuilding, I remove the end
spool-plates [from the take-up spool] and add a cardboard shim on both
ends cut to the size and shape of the core of the take-up spool.  This
adds about 1/8" to the width of the take-up spool.

For your information, I also set the tracking assembly to shift the
roll to the right (treble) about 1/4-inch.  This requires me to pull
the left flange out about 3/8-inch, and it must stay there.  On re-roll,
the paper never touches the edges.  I don't even have to worry about
playing Audiographics.

Bruce Grimes