The root edge tip comes to a narrow point, the balsa is cross grain. It's an easy end to break off when cutting it out.
So, I didn't cut it out. I left it on.
The inside round trailing edge was carefully sanded with some 400 grit around my Sharpie barrel.
I ended up stacking the fins for strength while sanding.
Leave a little squared lip at the back end. Considering the balsa grain is a weak point, you don't want to sand to a knife edge.
While sanding smooth the CWF filler coat -
As careful as I could be, I still had one of the ends pop off!More glue, filler/primer and sanding.
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