There are six fins total, two pieces per fin.
Glue these up against a straightedge. I like to set some small weights on the glue joint seam so both pieces end up flat.
The upper fin root edge is glued to the body tube -
The root edge on the low fin is angled to fit the 20/50 adapter.
Speaking of the adapter - There is a tie down loop on the top.
I would think this might stop the ejection charge. Except for an open rectangle space under the tie loop, this seems like a blockage.
This question came up on a forum. Estes replied that it doesn't impede the ejection charge or deployment of the parachute.
I cut the end off using a razor saw.
Here's the new open top end after rounding off the rough sawn edge.
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