When the tension drops, springs cause the clutch to launch. Evenly spaced ridges, named splines, line the inside and out of doors in the clutch to lock in to the gears and the clutch housing. You could read through more about these clutches in How Automatic Transmissions Do the job. https://clutchplate43085.bloggosite.com/39839699/top-latest-five-clutch-plate-urban-news