Headrest Removal TF 2002

Been doing some leather dressing (car!) to the seats on my TF160 today,

thinking of getting the alloy seat belt height support things that are available. Being of limited mechanical ability I like to check that each job is within my abilities. Thought I would check by removing the headrests. Any other car I have had you just squeeze the button type thing around the metal surround and off they come. Cannot see such a button on the metal shaft surrounds so headrests just rise to maximum height and no more. Do I need to use force or hopefully missing something really simple?



Thanks in advance

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