When the tension drops, springs trigger the clutch to launch. Evenly spaced ridges, known as splines, line the inside and out of doors of the clutch to lock to the gears and also the clutch housing. You can examine more about these clutches in How Automatic Transmissions Do the job. https://clutchplate76418.blogdomago.com/31996287/the-fact-about-clutch-plate-that-no-one-is-suggesting