What's the trick to removing the RH air vent assembly on a 1966 C60 car? This is the metal assembly containing the vent door that sits behind the outer AC air box and wraps to the RH air vent. I've removed all the engine compartment nuts and an interior bolt (very difficult to get to) but the entire assembly is still very tightly held. The AIM and Service manual are not helpful at this point...

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