The instructions have you cut out the fin cutting guide. I left mine on the instruction sheet.
All the cut lines were extended beyond the fin borders with a pencil and straightedge.
With the fin material taped down on the template, it was easy to extend pencil lines onto the plastic sheet.
You only have to cut (score) about halfway through the sheet plastic. You can then flex and crack the fins down the cut lines. Be sure the sharp upper tips are well scored for a clean break at the narrow tops.
On the right -
I used small flat end pliers to crack the narrow excess plastic from the outside edges of the fins.
The fins are small and a little tricky to true up. Still, stack them old school and hold tight while sanding on some 220 on a block.
I rounded the leading and trailing edges with 400 grit.
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