The instructions have you glue the rear fin half on,
Then glue on the upper half (and hopefully match up with) the low fin.
I've got to give John Boren props for the design. It's an amazing assembly but needs some fine tuning before gluing down the root edges.
As careful as I was assembling the halves, I didn't get a perfect fit.
With the upper fin half taped down to the body tube, I held the lower half to meet and touch the upper half. It needed adjustments.
The angle of the bottom half should to be lowered, sanding with emphasis on the front end of the assembly, ahead of my thumb.
This tipped down the front and made for a better joint at the juncture of the two halves.
I still had to make some sanding block adjustments until this outside end joint was fully closed.
You should fit the fin pairs separately. As you fit two halves, pencil mark sets 1, 2 and 3 on their inside surfaces to keep track.
There is good reason why this is a Skill Level 5!
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