Here's one of the best balsa shaping tools available.
I first used an emery board in the 1970s when forming airfoils on the Estes V-2 fins. In the instructions, it was suggested for fin shaping.
Back then we only had the small brown garnet, coarse "files".
I should clarify - a fingernail file is metal, an emery board is like sandpaper glued on cardboard.
This board is much larger, 3/4" wide by 7 1/2" long. There are four different grits, two on each side. The roughness spans (around) 100 grit coarse to 400 grit extra fine.
The great thing is, these boards don't really load up. If they do, they are washable.
The board in the picture is probably one year old and has been used many times. It has a stiff, padded surface.
You can pick them up at beauty supply stores like Sally Beauty for a few dollars each.
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