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I
still couldn't figure out how to remove these SE wheel centres

despite being told I was 'clevva' enough to teach Physics and sign people's passport applications! Anyway I exorcised this ghost myself.

On the 15" SE wheel they are removed from inside the wheel to outside - so you have to take the wheel off first.
From the inside I soaked the black tangs in release oil and used a plastic trim tool as a lever to ensure they 'moved', then later gently went around with the shaft of a hammer on each pair of tangs - hitting the hammer shaft gently with a second hammer, slightly angled towards the centre, then firmly once in the middle - and out they popped.
To reinstall
they go back in the same way (which originally seemed confusing to me) and are held in place by the black tabs (that you have moved then tapped in pairs) like in the 2nd pic. They don't go back in from the outside 'cos they can't, as shown by the last pic...
Hope this helps another 'newbie' like me who wants to get a front wheel balance...
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