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1.Don't change the turning directions too frequently,otherwise.it will damage the grinding head
2.Turn the speed control counterclockwise to decelerate the grinding head to the minimum before turning off and switch the main power source to 0
3.After operation put the grinding head on the top of the mail panel
4.When adjusting the speed, do not press the right switch button, wait for the handle stop and then press
5.furlong idle time,please disconnect the source power
















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