HIGH EFFICIENCY: the end is machined with a full radius to avoid damaging the top of the piston. Very easy to use and very handy when doing your own saw or other 2 stroke job. CLUTCH REMOVAL TOOL: This is a general piston stopper that requires the crankshaft to be held in place. SCOPE OF APPLICATION: Can be used to hold clutch or remove flywheel nut, or to repair feed brushes and leaf blowers. EASY to REMOVE: Simply remove the spark plug, screw in the tool and gently tighten. Remove the spark plug, screw the tool into place and lightly press it. EASY TO USE: Rotate the engine clockwise or counterclockwise until it appears that the piston is in conflict with the ’tool and ready to be repaired. Note that most chainsaws have threads on the left side of the clutch. Features: This is a piston stopper for service that requires holding the crankshaft in place. Can be used for clutch service or flywheel nut removal or servicing weed killers and leaf blowers. Just remove the spark plug and