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What is the reason why the infrared edge trimmer does not turn to 0 degrees?

The switch is rusted inside. The position of the oil inlet and water inlet of the zero switch is incorrect, which leads to internal corrosion and poor contact of the zero switch. The edger cuts the head of the bolt blank upset by upsetter into a hexagonal head shape. Ultrasonic lace trimming machine adopts the latest ultrasonic technology, which is widely used in world-famous original equipment with advanced technology, reasonable structure, reliable operation and convenient operation.