I did the "knapping" thing for a while, but noticed I was knocking off fairly large pieces of the flint in knapping it, so I looked around for a better way to make and keep my flints sharp... and I found it.
Harbor Freight has a diamond impregnated file set (9 or maybe 10 small files of different shapes and sizes) for $9.95 that work just great for sharpening and shaping the "nose" of the flints. A few strokes of the file and the flint's edge is sharp again with no real loss of the flint's body itself.
This method seems to be a much better way to sharpen the nose of the flint and there's no chipping away of the flint itself. Thus the flints are lasting a lot longer. So I carry one of the several files in the old fishing tackle box in which I keep all my muzzle-loading "stuff" to take to the rifle range with me when I go shooting.
My old tackle box is like a "possibles bag"... and is very handle to carry to the rifle range, but naturally, I don't use it when I go hunting... it's too big and clumsy for that use.
Jus' my 2˘...
Strength& Honor...
Ron T.