When the motor mount assembly and plastic reducer was slid into the main tube, I found one side of the shoulder lip to be wide.
In the picture, the left side of the shoulder is a good fit, the right side has a noticeable step.
I taped the reducer in place and pencil marked fin positions 1 - 4.Because the shoulder lip was narrower on one side, each root edge fit was going to be different. The fins have three angles on the root edge. Each fin would be individually fitted!
Fin 1, on the wide side, fit well when removed from the balsa sheet.
Fins 2 and 3 (opposite each other) took a bit of sanding and ended up with the same root edge shape.
The Fin 4 root edge took more shaping and had a "step" at the body tube and reducer joint contact point.
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