Abstract: A carton end closure score line breaker mechanism for pre-breaking the top closure score lines before the filling and closing and sealing steps does not include a center post, or any components which extend into the inside of a carton end closure, eliminating any chance for contamination inside the end panels. The center-free breaker mechanism includes a pair of blades each having an arcuate center section for caving in the adjacent end panel and, thereby, bulging the side end panels and pulling in the oppositely disposed panel, and a blade fork and another pair of blades, wherein the blade fork includes two longitudinal, parallel blades which slide across the side body panels, and each blade of the other pair is a flat-faced bar for engaging the adjacent end panel and causing the side end panels to project outwardly completing the pre-breaking of all end closure score lines.