Delixi 15 reverse switch handle leakage

Hello; how did you find out? Is it an electric shock? Or do you still have the feeling of something wrong? This phenomenon may be caused by poor insulation inside the switch or electrical appliances, or leakage caused by humid weather. What is the situation? You must now connect a wire to this switch and nail it to the ground with a steel braze, or connect it to a metal that can be grounded, which means it is grounded reliably. This is a safety measure that must be done. I hope you will adopt it