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What is the size of the hex head screw used on the cover for the small drive chain sprocket. (The same size screw head also fastens the windscreen.)

I have an Allen wrench that fits, but it's tight to remove the bottom screw for the chain cover and would like to get a T handle version. But unfortunately, my Allen wrench metric kit does not indicate sizes(!).

Looks like either 2.0mm or 2.5mm, can someone please confirm?
 

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Would a friendly call to where you will be getting your ducati serviced be any help?
 
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I changed my windscreen and I think it is 4mm. I also think that this Allen key is under your seat.
 
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