Another option would be to go to an lbs and ask if they have an offcut of a threadless steerer. You then make a slot on one side wide enough to allow the off cut to compress into the bottom of your steerer tube.
... a bit like:
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@hugo7 started
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Another option would be to go to an lbs and ask if they have an offcut of a threadless steerer. You then make a slot on one side wide enough to allow the off cut to compress into the bottom of your steerer tube.
... a bit like:
1 Attachment