Score around the raised spin nozzles leaving about a 1/16" edge. Bend and crack off the sides.
Hang onto the larger scrap pieces. You might need them for patches on the fin edges. Anytime I've worked with vacu-form parts before, I've needed patch plastic.
Looking ahead -
The instruction illustration shows a spin nozzles being glued in place. The drawing shows a flat edge border around all sides of the spin nozzle piece.
That's not how they end up after sanding in the bottom curve.
I taped some 220 grit sandpaper around the low nose cone piece.
Go back and forth in a straight line (here going left to right, right to left) over the sandpaper.
The two side curves will be reduced first, the straight top and bottom edges are reached last.
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