You can loosen the crank pulley by holding the outside of the pulley still (we used an old belt) and turn the crank bolt using a 3 ft. cheater bar. You need a LOT of torque. Use a 3 ft. or longer bar and turn that bar real good to loosen it. It's pretty hard even with air tools and you definitely don't want to use air tools to tighten the aluminium crank pulley. They'll deform using air tools so again, use a long bar to tighten the crank bolt.