Steve, I do the same with the Durbro hinges. I find that a 3/32 ball shaped bur mounted into the Dremmel tool works very well for the notching. I only notch the movable surface (elevator, rudder, aler.....) this allows you to move the control horn back further onto the surface for more stable mounting. Keep in mind if you use this method of hinging, to leave enough gap for maximum desired throws of the control surface.

"if your not afraid, it's not fast enough"