Who hasn't? You are happy because the new cylinder has finally arrived and already during the installation the dilemma happens: the piston ring cracks when trying to bring it over the piston. With this tool this is over now. In addition, the piston ring pliers can also prevent later engine damage. E.g. if the piston ring has got a hairline crack during installation. Absolutely professional tool that should not be missing in any moped tuner workshop.