If it's anything like the barends I used to run on some old Carbon bars pop some kitchen foil up the inside for clamping...
Hmmm, im not sure how much I'd trust foil for a seatpost, I have some brass though so I might try that.
Coke can aluminium is about 0.15mm thick. Two full turns of that and you'll be up to the correct diameter.
@spotter started
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If it's anything like the barends I used to run on some old Carbon bars pop some kitchen foil up the inside for clamping...