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If in doubt buy one of these as spare...
https://www.sjscycles.co.uk/frames/brompton-handlebar-stem-pin-expander-cone-bolt/
I really doubt you will fuck it up though!
When refitting just make sure the notch is in the gap
sbbohr
@R.hobbs and @TM thanks, was worried I'd irreparably ruin something, especially after watching a couple of YouTube vids showing rather gentle taps followed by it sliding straight out. I'll go at it with renewed vigour tomorrow.