The problem of rolls "stuttering" is not unusual, especially when
playing large rolls.  Bear in mind that as the paper crosses the
tracker bar, it adheres to the tracker because it is under suction.

When playing a large roll at almost any tempo there will likely be
some slack in the roll as it is taken up.  This is exacerbated if the
tension brake has been adjusted too loose on either the play chuck or
take-up spool.

As the paper builds up on the take-up spool, the more paper layers it
builds, the more slack it has.  As the roll plays, should the paper
come across the tracker with a section of roll where it has few or even
no perforations, the paper has a tendency to "stick" to the tracker.

Remember, the tracker bar as it is applying the full strength of its
suction across the entire roll.  This is especially true at loud volume
as increased volume equals increasing the tracker suction.  It is also
especially true towards the middle or end of a large roll where much
slack has built up in the take-up spool.  The strength of this suction
under these condition is great enough to hold the roll in place on the
tracker for a moment while the take-up spool tightens all of the slack
out of the preceding paper it has collected.

Adjusting the tension on the play mechanism may help.  Likewise, making
sure the tab/hook lay flat on the take-up spool will help.  Sometimes
the glue holding the tab to the leader is hardened and deformed with
age, inhibiting the paper to lay flat as it is taken up.

Adam Aceto
Burbank, California