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28.6mm, supplied in 'as-machined' condition, the engraving is about 0.2mm deep so there's scope for end-user polishing if you want shiny.
Steel stem is 28.2, so the 28.6 should sit nicely (campag cap is 30.8)
I'll look at your thread in classified for the drawing of your cap... I wonder if I could use the campag centre bolt with your one... It says record, quite keen to keep it, not often I treat myself with components...
28.6mm, supplied in 'as-machined' condition, the engraving is about 0.2mm deep so there's scope for end-user polishing if you want shiny.