I decided to assemble the fins and rings then spray it red as one unit. It'd be impossible to mask and paint it after it was glued to the body tube.
Here the fin is slid into the lower plastic ring.
You can't snap the fins into slots on the ring. There are ridges on the root edge of the fins that slide into the raised "geared teeth" on the rings.
This is the finished fin unit.
I slid everything in place dry - no glue, and checked for alignment. Small drops of thin CA were placed at all the joints and allowed to run into the seams.
The short launch lugs are slid into the teeth. With this fin can design, the lugs can't be centered between two fins. However, it does allow for either three or four fin placement.
The fins are thin plastic, you can see the vertical molded ribs could add strength.
To be honest, I always thought this was an ugly fin can design. But it would help a first time builder to get four fins in alignment.
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