The fins were set up on their root edges for primer painting.
Notice the booster fins are masked away from the root edge. I didn't want a lot of paint thickness to hamper the fit of the fins in the slots.
Here's the fins after sanding down the gray primer.
Again, note the masked area on the larger booster fin.
To clear the wrap of electrical tape around the engine mount tube, I had to file in a long notch, a little wider than the tape span.
This notch will insure the top and bottom of the root edge will glue solidly to the engine mount tube.
All four booster fins in position.
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