If it’s any help Cane Creek does a 30.9-31.6mm shim…
https://canecreek.com/product/shim-30-9mm-to-31-6mm-aae0111/
Cheers fella. I did consider that, briefly. But in my limited experience of shims they're always a far from perfect solution.
If no interest at £xxx I'll either keep it or whack in on the bay next time they discount their scandalous sellers fees for a weekend.
@yetidamo started
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If it’s any help Cane Creek does a 30.9-31.6mm shim…
https://canecreek.com/product/shim-30-9mm-to-31-6mm-aae0111/