Josam Products' Play Detectors are used on all axles to locate worn or loose components prior to alignment or during safety inspections. They simulate turning, braking and acceleration forces on the steering, suspension and chassis. The Play Detectors check king-pins, torque-rods, spring-eyes, u-bolts, shackles and all the other parts that locate the axles to the frame. A control unit provides control of the travel, direction and frequency of the individual plates.