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If you do not have this equipment, you can not service this tool. Hypot testing is a safety test required by Underwriter’s Laboratories. It basically ensures that there are no live metal parts exposed on the product. This condition could occur if, for instance: 1. A housing screw went through a wire. 2. A wire was stripped back too far and the bare wire contacted a bearing or the driveshaft. 3. A wire was damaged and came into contact with a bearing or the driveshaft. This is a very serious