I do what some others are suggesting...use a razor plane and go slow at it. Then use a sanding block. Make sure you are resting your aileron, elevator, or rudder on a very flat and smooth surface. NOW, here is my tip...use double stick tape (cellophane, not foam) and in a few places on the elevator, apply 1" strips to the wood, close to the LE. Stick the elevator down right on the edge of your smooth surface so that you can sand it without the razor plane or sanding block hitting the table. Flip the elevator and do the other side. This frees up both hands and really helps to get a consistent bevel on the LE. Hope that works out to be as helpful to you as it has been for me! Jon