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@ewanmac
So options:
1) Try to find a new 27mm crown race and hope it works with the existing Campag headset
2) Find and buy a new JIS 1" threaded headset
3) Attack the fork crown with a lathe
4) Revert to the nasty headset that came with the frame
Option 1 is probably out as I'm not so optimistic about interchangeability of crown races and I don't have time to bugger about trying a solution that won't work. Option 2 seems like a good bet but I searched and couldn't find any on the obvious websites - either they were ISO/italian or didn't say (assume ISO). Option 3 sounds scary and I don't have a lathe. Sadly option 4 is probably the front runner (at least for now) but the original bearings have been lost - How on earth do I tell what size ball bearings my generic headset should take??