648828 Jam Nut Valve Adjusting Tool

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Makes adjusting valves easier. Designed for engines with a 12mm jam nut and slotted valve adjusting stud. View window shows screwdriver blade position for easier engagement. Unique all-in-one design positively tightens jam nut while preventing stud movement. 7-1/2" handle provides necessary torque for loosening jam nuts.

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