The large, square rear fins are glued on even with the end of the body tube.
Before gluing on the upper fins, the body tube edge got a quick wipe with CA glue. The edge was a bit rough. With the CA glue on it could be sanded smooth.
The upper fins were aligned with the help of clothes pins. This works well if the balsa is hard. Soft balsa might be scarred by the clamps.
On the clothes pins I used - The wood halves are removed and flipped on the center springs so you clamp with the back, longer flatter end.
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