【HIGH EFFICIENCY】: The end is machined with a full radius to prevent damage to the top of the piston. Very easy to use and very handy when doing your own saw or any other 2-stroke job. 【CLUTCH REMOVAL TOOL】: This is a general purpose piston stopper that requires that the crankshaft is held in place. 【SCOPE OF APPLICATION】: Can be used to hold the clutch or remove the flywheel nut, or to repair power brushes and fan blowers. leaves. 【EASY TO REMOVE】: Simply remove the spark plug, screw in the tool and gently tighten. Remove the spark plug, screw the tool in place and press it lightly. 【EASY TO USE】: Rotate the engine clockwise or counterclockwise until it appears that the piston is conflict with the tool and is ready to be repaired. Note that most chainsaws have left hand threads on the clutch side. Product Description This is a maintenance piston retainer and the crankshaft must be secured in place. It can be used for servicing the clutch or removing flywheel nuts or servicing weeders