Got mine at condor https://www.condorcycles.com/products/condor-star-nut
Needs to be a bung not a star nut! That’d kill the carbon steerer
Have thought about bonding a sleeve into the the steerer as I had done with the cervelos I’ve owned but also struggling to find a suitable piece of metal
@BlackMath started
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Got mine at condor
https://www.condorcycles.com/products/condor-star-nut