well prepared little triumph 675 in the pits, started looking around it and noticed some additional hoses running to a lever on the right-hand clip-on, thought it may be some sort of thumb-brake for the rear brake but the rear brake lever was still fitted, then i noticed that the clutch lever was missing, it all made sense when i saw the bike in action, the rider was missing his left arm from the shoulder, didn't seem to hamper him very much, he came home in fourth position, big respect due mate.