Harmonic Balancer Damper Install Tool Kit 240Z 260Z 280Z 510Kit for installing the harmonic balancer on any "L" series Nissan engine. The balancer should slide on the crank easily but we have found some instances (aftermarket balancers) that may require extra force. The factory bolt is too short and should not be used as it may damage the crankshaft threads. This stud nut washer combo allows for full engagement of the crank threads and simply tighten the nut to press the balancer on.