Size of main sail sheet

Nicolas Klene

Hello everybody 

can somebody tell me if  there main sail sheet coming in the cockpit on the winch on the mizzen mast is 12mm or 14mm is mandatory ? 
I have 14mm , and was wondering if it would be safe to reduce to 12mm ?
merry Christmas to all 🎄

Nicolas Klene
SM2K # 471
In Marseille

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