This is a spare parts build.
The scrap 3/32" balsa sheet edge was a bit banged up.
Before cutting out the fins,
The soon to be leading edges were sanded square using a sanding block.
Old school:
Tracing around a cardstock template using a pencil.
I don't like using a pen. Unless the ink is sanded off, it will bleed through the final paint.
On hand cut fins, gang sand them.
Stack and square them up using a sanding block with 220 grit.
On the left is the upper fins,
On the right are the lower fins.
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