Ouch.
Sorry to hear that mate.
As for a manual, I have the Ducati factory w/s manual .
I have heard of a fewother Dukes doing this including punching holes in thecases but have never known them to wreck the gearbox.
AGE996 had this happen to his bike a while ago - may be worth you dropping him a U2U.
This is the thread he started on the subject.....
Click here... Hope this helps & you're sorted quickly.
Andy