I'd go for the torx method as well. Try and tap one in that is slightly bigger than the hex hole and hoepfully it will cut into the hole and allow you to turn it. Strange because I had exactly the same problem with my 748 today when trying to remove an exhaust hanger!
Bikes: R1200RT F800GS. Hopefully another Ducati soon
Posts: 2,526
Join Date: Apr 2005
I rounded off the inside hex of a bolt tonight luckily on the bracket that holds the pannier frame on. I removed it together with the A bracket that it was bolted to drilled a small hole right through the bolt then used a stud extractor. I was relieved to see the little bar steward come out. I would like to thank 3X for using about 300 million newton metres to tighten up such a poxy small screw. Good luck, Im sure Halfords sell stud extractors.
Had this happen to a sump plug - right ******* to get out. The only thing that touched it was a set of extractors from Snap-on tools. Very expensive, but I have used them countless times on Ducati cheese screws, and always with success.
When using extractors, you can also try using a plumbers freeze spray to make the offending bolt contract and loosen.
You can also use a pin punch that is larger than the head of the bolt. Hold the punch over the head of the damaged screw and hit with large hammer. This will get the shape of the hex back (if not too badly rounded). Then use an impact screwdriver with a hex bit.
11-Jun-2005, 23:32 
Ducati dealer,£55,not cheap,but will probably pay for itself
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