burnish the fold using the back end of a Sharpie to make a sharp crease.
Your wedge fin should look like the inset picture.
Notice the fin hasn't been cut out yet.
Open the creased fin to cut the details.
Score the glue tab (upper center) before cutting.
Cut the small retaining ring notches first. You can freehand cut the small cuts and use the straightedge for the longer ones.
Cut the glue tab and fold on the dashed lines.
Finally cut out the fins on the outside lines.
When the fin is first creased the root edges will be rounded.
Pinch the upper end of the creased leading edge to coax it into a sharper wedge shape.
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