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Service or maintenance performed by unqualified personnel could result in a risk of injury. 24.,When servicing a tool, use only identical replacement parts. Follow instructions in the Maintenance section of this manual. Use of unauthorized parts or failure to follow Maintenance Instructions may create a risk of electric shock or injury. USBOOS-l Specific Safety Rules 1. Always use proper guard with grinding wheel. A guard protects operator from broken wheel fragments. 2. Accessories must be rate