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Title: Stay away from this unit!
Review: I have always paid to have my chains sharpened. The last two years have required more cutting and more sharpening. Having never bought a sharpener before, I figured, go with Northern since they have been a very solid company. While sharpening my 3rd chain, smoke developed from the motor and in seconds, the motor froze solid. Cheap motor, cheap unit. Wrote the company several times without a response. Not only did I lose $41 (shipping and the unit) but Northern lost me as a customer - over $29.95. Don't purchase this unit. You will be very disappointed.
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