I did my best marking the body for three fins.
A corn cob doesn't fit any available fin alignment guide.
Slots were cut for the fins using my aluminum angle as a guide.
The fins were cut from 3/32" thick balsa. I had to go back and widen the slots. Not a big deal - the fit was very tight and secure.
The fins were glued in place with white glue.
A launch lug was glued beside a fin root edge. I slid a segment of launch rod into the lug to make sure it would clear easily.
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