One of the nice things about Duo-Art tracking systems is that they
are user-friendly.  With a couple of screw drivers (small and smaller),
they can be adjusted to fit your favorite roll.  Once the rebuild is
finished, I set up the tracker system this way:

1. Make sure the pneumatics are centered, i.e., they both need to move
an equal distance left and right.

2. Make sure the rod that goes along the back side of the spool box
is snug and perpendicular in its connection to the tracker pneumatic.
The rod end is threaded so that the overall length can be adjusted.
There are nuts that can be tightened here.

3. Make sure that the cam on the upper spool shaft is centered so that
it can move equally up and down.  Adjust this by adjusting the length
of the rod in #2 above.

4. Put a roll on and manually turn it to point where a number of holes
across the tracker bar are exposed.  Set the cam in #3 so that it is
centered.

5. Only now is it time to consider the tracker ears.  They can be
adjusted by loosening both screws on the ear mounting assembly.  Trial
and error may be necessary to get great results.  I set them so that
the ears are just not quite touching the paper edges when the paper is
rolling well over the tracker bar holes.

6. Not as hard as it seems, was it?

Some other things to check are

7. Were the pouches below the tracer pneumatics replaced in the
rebuild?  Sometimes they can be stiff and unresponsive.  Sometimes they
can leaky and unresponsive.  Sometimes the chambers can be filled with
dust, making the pouches unresponsive

8. Are the pneumatics air-tight?  They work on low suction so any leaks
are significant.

9. Have the little bits of leather at the back of the ears been
replaced?  They close over an open tube and must be air tight for
the quickest response.  A tiny piece of pouch leather is all that's
necessary.  In a pinch, duct tape may work.

10. Does the rod in the upper left corner move freely?  Lubricate it
with light oil if necessary.  Can it push all your rolls all the way
through their possible range?  I.e., can it push all the way to the
right such that the cam can turn to its farthest out point?  Adjust by
moving the round doughnut shaped stopper.  It is held by a screw driven
against the shaft.  Loosen, adjust and tighten.  At the same time make
sure the rod on the right side can slide fully back and forth as well.
This would be a good time to see if the gear on the upper right hand
rod is centered over the lower unit.  Just an observation...

All that needs to be done once, maybe only checked at this point.

11. Now, with everything buttoned up, you can still adjust the tracker
ears for proper operation.  When things are right, the rolls go forward
with minimal tracking.  Rewinding will be as easy as well, with no
scrunched windings.

Jeff Davis