The instructions specify a 15 degree angle of the spar. This is critical!
You can have a variance of + or - 1 degree.
If the angle is much wider the the upper unit won't rotate.
If the angle is narrower, the engine exhaust will scorch the fin.
The picture shows the spar assembly glued in place. I glued the spar assembly opposite the vent hole. You can see the slot for the main spin unit fin.
Look down the tube from the front and be sure the fin spar assembly is in alignment.
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