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You could try placing a matchstick, heavy toothpick, twig or combination of any of them behind either the flint or piece of leather to push the flint forward. Remember, you are dealing with pieces of rock and will likely find no two the same. Not that difficult to shim them forward a bit to get them where you want them. Definitely easier than positioning ones that are two long without giving the flint a bit of a haircut….. though a haircut may be necessary with the next batch of flints if you find them too long.  It all comes down to what works or doesn’t work in your lock, with or without ‘adjustment’.