If you're going through the effort to have the CK top nut altered, a far less destructive and similarly faffy option would be to have a spacer machined for the collet and tapped on each end (guessing female –> male).
@Batt good shout. I’m talking to a machine shop tomorrow. Will see if that’s an option.
Very interested to see what you come up with!
I’d have long since cut the steerer or just bought a NOS 2Nut and sold the GripNut.
@jimalex started
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If you're going through the effort to have the CK top nut altered, a far less destructive and similarly faffy option would be to have a spacer machined for the collet and tapped on each end (guessing female –> male).