A portion of the sharpener handle is recessed to receive the curved blade of a lopper. A fault detection system is provided for detecting an open circuit or high resistance fault in a ground circuit. In an exemplary method of the invention, the silver nanoparticles may be produced in timer periods of less than about 30 minutes, and at temperatures of less than about 40\xb0 C. The driven plate 15 is fixed to the turbine 4. A method for the treatment andor car andor protection of the eye comprising wearing contact lenses impregnated with a suitable composition and a composition for disinfection andor conservation of eye care products is also disclosed herein. The coupling of the drive lead to the motor lead is prevented responsive to a temperature of the braking load exceeding a predetermined disable set point.