Drive sockets are fail safe mechanisms used to couple the motor to the blade assembly in Vitamix® machines. They are designed to protect the operator and the motor in the event a blade assembly is blocked from rotating.
Drive sockets also help reduce blending noise. A properly installed drive socket should be attached, but slightly loose. This will allow the drive socket to align with the container, reducing noise while blending.
Drive sockets are the most commonly overlooked wear item, and should be checked weekly according to the Blender Care & Maintenance Guide.