I've sharpened a few blades with my dremel and it does a fine job of eeking a little more life out of them. I was wondering though - what's the preferred method? I've seen some that sharpen the gullet side with a round stone and others that sharpen the back of the tooth with a flat wheel. Is one method better than the other? Also, do you try to sharpen according to the set of the tooth or do you keep your sharpener perpendicular to the blade?