Jicafold I was wondering if maybe a cheaper steerer had been used for a donor and therefore a narrower inside diameter.
Did you try removing the locknut and wedge and trying to insert the quill?
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk