I addressed the damaged fin paper the same way I did the de-glassined tubing on the Sea Sting, painting it with white glue thinned with denatured alcohol, then sanding. Seems good. Ideally I probably should do a second application, and maybe I will, but for now I’m moving on. I stuck in three C6s. Here’s the motor retention in action. Experimentation pretty well agreed with simulation: To get the CG where I wanted it, at the middle of the launch lug, it’d need about 5 grams of nose weight. Seven lead BBs and a dowel plug came to about the right amount, and hey, look, there’s already a hole drilled in the nose cone. In went the BBs, the dowel, and some glue.