On the final‑assembly line of a car‑body plant, the spring‑ring plate is fitted inside the door‑panel welding jig to lock the actuator shaft that drives the clamping lever. By providing a reliable axial stop, the plate keeps the shaft from drifting when the pneumatic cylinder fires, allowing the clamp to close with repeatable precision during each weld cycle. This retention function also simplifies tool changes: when the jig is swapped for a different panel size, the spring‑ring plate can be released and re‑installed without adjusting other components, reducing downtime. In high‑speed paint‑shop robots, the same type of plate is used on the rotary head that indexes large panels, ensuring that the motor’s output shaft remains firmly seated while the robot pivots at several revolutions per minute. The result is a stable motion platform that tolerates the vibration and torque spikes typical of rapid paint‑spray applications, keeping the positioning accuracy required for flawless surface coverage.