Coupling made visible: shown here is the evolution of core (solid line) and envelope (dashed) rotation rates from the ZAMS to the start of the AGB phase. Differences between the two models become visible at the start of the hydrogen shell burning phase, where the model without TS dynamo and ν_add shows that the core and envelope rotation rates move apart, while the model including a ν_add of 10⁷ cm² s⁻¹ shows the rotation rates are coupled.