Hello, every one, does any one know and (i am sure there is) on the a10 barrell, there is a grub screw with a 3/16 ball and a locating pin, two screws at the end, havent got a clue as to what they do, and can they be fitted when barrell is fitted also is there a spacer req on the clutch case at the rear end, its just want to do this bike correctly.