Got a set of these Acerbis Dual Road Handguards, but have a slight problem fitting them. These hand guards fit into the bar ends, but when I remove the bolt for the bar end weights, the bolts supplied with the hand guards are considerably bigger than the bar end weight bolts, and so will not screw in. I could use the bar end weight bolts but they're not long enough. So is it possible to get longer bar end weight bolts, or is it even possible to remove the bit inside the handlebar in the hope that there is a bigger screw hole available for the Acerbis bolts to fit into..?