Genuine OEM Volkswagen Belleville Spring, part number 01E409791. This part functions as a belleville spring, likely used for preloading bearings or providing a specific spring force within the drivetrain assembly. It is marked as number 10 in the diagram. The spring is made of metal and has dimensions of approximately 0.079m x 0.079m x 0.002m. Genuine OEM belleville springs are critical for drivetrain components, ensuring precise force application and durability under load, which is essential for smooth operation and longevity.