Introduction
Tools
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            The head is attached with a machine screw and a split washer to make the head hold its position. 
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            If the head slips sometimes the helical split washer can be bent out or replaced. 
 
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            Spring: holds ball bearing against pawl 
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            Ball bearing: holds pawl in its position 
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            Pawl: allows gear/tang to rotate in only one direction 
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            Gear/Tang: part that rotates 
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            Lever: selects the pawls position and what direction the gear turns 
 
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