On to the ribs! I used a nifty tool called a nibbler to trim away the metal outside of the marks as shown. Others have used a dremel with a reinforced cutoff wheel to do this work, but I did not seem to have very good control when practicing with my Dremel tool on some scrap aluminum. This nose rib has to be trimmed to clear the reinforcement angles on the front side of the spar. The tape is "frog tape," which is mainly used for masking very clean trim lines when painting. As it turns out, it also makes a good straight edge for marking lines. Note the chunk missing on the right side which has been "nibbled" away a little at a time.
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