Features: 1) The guide handle offers a highly engineered, built-in shock mount system to reduce HAV (hand-arm vibration) and improve operator comfort 2) Utilizing crank shaft and coupling rod configuration instead of crank and cantilever structure, which improve a great operating performance and service life 3) Well balanced performance reduces operator effort, non key seat design double service life of inner-cylinder body 4) Easy for dismounting and low cost for maintenance