Eventing bit diameter rule?

I cannot find anything in the rule book or annex about the minimum diameter of snaffle bits (not curbs or bridoons). My mare has a very small mouth and goes in a 12mm eggbutt lozenge mouth. Legal?

3g of the current annex under permitted snaffles? “The diameter of the mouthpiece must be a minimum of 10mm at the rings or cheeks.”

https://www.usef.org/forms-pubs/bGxapei4PLA/eventing-annex-1---bits-saddlery-and

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darn, how’d I miss that? thanks!

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