A casting shake-out unit (1) has an outer cylinder (3) and an inner cylinder (5). The inner cylinder is made of a plurality of interfitting segments (9) which interlock and cooperate with each other to prevent a segment (9) from falling out of the completed inner cylinder (5). Each segment includes tongues (35) extending from opposing edges of the segment's body (11) and pockets (45) formed in the body. The pockets (45) of one segment (9A) receive at least a part of the tongue (35) of a neighboring segment (9B, 9C).
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