```\nfunction \_startRotation(bytes32 schainIndex, uint nodeIndex) private {\n    ConstantsHolder constants = ConstantsHolder(contractManager.getContract("ConstantsHolder"));\n    rotations[schainIndex].nodeIndex = nodeIndex;\n    rotations[schainIndex].newNodeIndex = nodeIndex;\n    rotations[schainIndex].freezeUntil = now.add(constants.rotationDelay());\n    waitForNewNode[schainIndex] = true;\n}\n```\n