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Well, you and me together, your picture of the clutch cover (1) has helped me make sense of it, I can now see that the oil is contained within part number 1 entirely as the only holes in it are the three that hold on the damper.
As my cover, part number 10, has no threads in the lugs or holes for bolts it can only be a push fit onto the damper. It now makes sense as it does not retain any fluids and is mainly a decorative part and a cover for the clutch damper. The clutch damper must only be a part that adds mass to the case to stop resonance, it cannot do anything else as it does not come into contact with the clutch.