When we implement SwManipulatorHandler2 in order to get callbacks from the IManipulator / ITriadManipulator we only get change notifications for the linear axis and not for the rotational axis from within the callback.
public override bool OnDoubleValueChanged(object pManipulator, int handleIndexInt, ref double value)
I think this is a Solidworks bug.
I get callbacks for linear axis
I get no callbacks for rotational axis