Lay a straight edge along the line drawn where the CF strips are meant to be glued in. All it takes is a couple of light passes back and forth to sand a groove for the CF strips to lay in. I tape the straight edge to the core to help hold it in place. As can be seen, the sander I made has a 1/4" piece of sandpaper on one side and 3/8" on the other. Some builders prefer to install the CF to the balsa skins. The sander works well there too. I prefer gluing the CF to the foam.

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