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Balancer shafts increase the running smoothness of engines by countering imbalances of the crank drive with targeted, compensatory imbalances. Hirschvogel balancer shafts have always been designed in a weight-optimized way, taking into account forgeability in large series production. Hollow journals continue this development. By means of forging alone, the journals are designed with a hollow center, so that an additional weight reduction can be achieved at the same imbalance.