ITEM NAME:14mm Metal Piston Stop Chainsaw Clutch Flywheel Removal Tool Flywheel 2 Cycle New Piston Stop Clutch Flywheel Removal Tool Flywheel 2 Cycle 14mm Chainsaw SPECIFICATIONS.(New Piston Stop Clutch Flywheel Removal Tool Flywheel 2 Cycle 14mm Chainsaw. Suitable for: Chainsaw clutch service or flywheel nut removal or servicing weed eaters and leaf blowers. 1) This is a piston stop for service that requires to hold the crankshaft in place.