The Jennerjahn tabber upgrade replaces the old style tabbing unit with a new reliable tabbing system. This system includes a new tabber horizontal pneumatic actuator, new tabber unit, and a new vertical motion seal rider roll assembly. This system eliminates the swing-over motion of the previous seal rider roll and eliminates the pivoting motion of the tabber unit. Additionally the tabber unit will now have a sensor to replace the star wheel, and a positive tab web drive roller.