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Thinning a hobby knife blade

When cutting doors and trunk lids open, file the sides of your #11 blade toward the tip to make the blade thinner. A thinner blade will make for a narrower groove, requiring less filler material to get a tight seal after the pieces are cut from the body.

Don’t make it too thin, or the tip will become fragile. To gauge exactly where you’re thinning the blade, take a black Sharpie and “paint” the sides of the blade. When you push the blade down your sharpening stone, the ink will be worn off the areas being thinned, so you can adjust the blade’s angle as you proceed.  

This also works when sharpening blades, not just thinning them.

Ed Maslin

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