A system for curing a portion of a tire assembly includes: an axially placement shaft; a first actuator; a first retainer plate; a core on the axially placement shaft; a plurality of first inserts each axially and radially engaging a radially outer surface of the core with first ends of the first inserts axially engaging the first retainer plate; a plurality of second inserts each axially and radially engaging the radially outer surface of the core with first ends of the second inserts axially engaging the first retainer plate, each second insert disposed circumferentially between two of the plurality of first inserts; a second retainer plate; and a second actuator.