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Ah fair enough.
It's not long enough to set the height for my wife's Brommy so I've been wondering about getting a telescopic post and chopping it down such that she could just pull it up to full height and it'd be right.
I'd need to work out if it'd still go low enough to lock the rear fold but if you're a more normal size (Mrs M_V is 4'11) then that should be less of an issue.
I should have said that I have tried the insert. I found I could never get it quite right, either 5mm too high or 5mm too low. I still have both said inserts so maybe I need to give them another go, but I was wondering if there were other solutions. Is there a Brompton seat post that has markings?