Over time, like all other motors or items that go through numerous repetitions, normal wear and tear may cause the device to get noisier.
You can remedy this by applying electric motor oil on the metal ring where the attachment heads go. Please see the photo above for your reference.
Squeeze electric motor oil around the inner and outer part of the metal ring, allowing it to seep for at least a few minutes before using the device.
- Only use electric motor oil to lubricate the device.
- DO NOT use automotive oil as this type of oil is too runny and thin for electric motors, and contains detergents that will damage the motor on your device.