Sharpening Dull Flints
Published: 09.18. 2008
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You can learn more on how to make the most of your flintlock in the upcoming book From Musket to Metallic Cartridge: A Practical History of Black Powder Firearms.
A more simple method is to use a small brass hammer or the spine of a knife to sharpen the flint. This is my preferred method for sharpening flints. Tap the knife spine lightly on the top of the flint edge when the flint is secured in the jaws of the cock. Flakes will fall off and sharpen the flint.
Flints cannot be sharpened forever, and you eventually will have to replace it, but sharpening it by using the methods described above increases the service life of your flints.