2-in-Line Messenger Balls

Two Messenger Balls arranged in a line — a Captive Ball assembly in which the ball-in-play strikes the first captive ball, which relays its momentum to the second. IPDB catalogs a single machine with this configuration: Combination Rotation by Gottlieb. The two-ball chain created a compact Newton’s cradle effect, requiring a firm shot to transmit enough force through the first ball to register the scoring switch behind the second.