The die-cut edge isn't perfectly flat.
I flattened the root edge with 220 grit on a block for a better glue bond.
The top corner edge of the fins glue to the bottom of the centering ring.
This should be a 90 degree angle.
I checked with my engineers square. Two of the fin tops needed sanding to square them up.
The centering ring was a good friction around the motor mount tube.
In the right side picture -
Notice the die-cut ring is slightly rounded on one side. The rounded side was hit by the blade first.
TIP: Glue the ring to the tube with the rounded side facing up. This will give you a better fit in the angled sides of the shroud.
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