In the event the strain drops, springs bring about the clutch to release. Evenly spaced ridges, identified as splines, line the inside and outside in the clutch to lock to the gears as well as the clutch housing. You may study more about these clutches in How Automatic Transmissions Perform. https://clutchplate00763.theideasblog.com/33506214/the-smart-trick-of-clutch-plate-that-no-one-is-discussing