1. Use the needle tip extension method: The needle tip extension method is to insert a thin needle into the bearing, and then slowly extend the steel ball along the bearing. This method is very dangerous, so you need to be very careful to avoid hurting your hand.
2. Use a magnetic pickup: The magnetic pickup can absorb the steel balls dropped by the butter nozzle. Although this method is simple and convenient, it should be noted that the magnetic pickup can only absorb the steel ball inside the bearing.
3. Replace the bearing: If the steel ball has been deposited on the bottom of the bearing, it can't be solved by other methods, so the bearing can only be replaced.