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Thanks Swiebertje.

For some reason I was unable to see that the clear plastic hose that has been used to set up our garden pond is a good clue as to where to look!

While I was thinking about all this, it occured to me that you need to increase (or decrease) the pressure in the buoyancy chamber by some means (for example vacuum cleaner, says The Book) and then stop.

That seems less than obvious.

Will it work to just whip the vacuum cleaner hose away and shove in a bung? Can you do that quickly enough to retain 125 mm of over pressure in the chamber?

If not, how else do you seal the chamber?