Originally Posted by motorhommmer
Is it possible to move the brake levers in slightly or it is possible to get bar ends that fit into the handle bar as opposed to bolting on around the end of it.
Flippant answer: Yes... and yes.
Better answer: You can move all your handlebar furniture inwards... including brake levers. All you need to do is loosen the clamps and just slide them over. The grips will need to be moved too. Most people use a wooden spoon or something to pry one end of the grips up and then spray something like Windex inside. This will sort of lubricate and allow the grips to be moved. Once dry, they'll be firmly positioned again.
You might be able to find bar-ends that fit inside the bar with plugs but they're pretty rare. The last ones I knew of were the old and no longer produced Answer Hyperends but even those ate a slight bit of handlebar space at the ends thus still necessitating repositioning of the grips, brake levers and shifters. They however did space the bar-end itself outboard to try and make up for it.
Most bar-ends use a clamp. You might also be interested in the
Cane Creek Ergo Control bar-ends which also work with the Lock-On system.