In the package there is a extra spare part. This is called a driver gear suit, what is in the motor drive. If this rubber is defect or not working anymore you can replace it according to below instructions.
|Take of the jar and you see the motor drive. Carefully take out the rubber part / driver gear suit with a screw driver or a pliers.|
|Replace the new one.|
|Please take note that both top sides are in the same level.|