I am repairing a Spirit 2M glider. I read an article by Mark Drela on sheeting the outer wing panels to reduce or eliminate tip stalling. He calls for shaving 1/32" of the top of the ribs from the leading edge back to the spar. Before I get too carried away with my exacto I want to make sure I'm doing this right. 1/32" is not much. Any suggestions or tips before I start shaving and maybe shave too much? There isn't much room in there as the wing in already built. Thanks in advance.