I made this post on another board but will repeat it here for those of you who may not have seen it. It is a worth while tip that came from the Dread Wechlo of the Great Rainy Northwest, Oregon, that is. We all receive humpy flints in a large order and find them to be less than optimum for use in our flintlocks. Don't dispair, as help has arrived. There is a little grinding wheel called a Mizzy wheel, that will solve your problems. It is some type of composition wheel that will grind the hump off a flint with little effort. I have done as many as 30 flints with one wheel. They are the size that can be used with a Dremel tool and standard 1/8" arbor. I am attaching before and after pictures of a flint done with this method. I bought a pack of 10 from a jewelry supply place called, not surprisingly www.jewelrysupply.com for $5. The postage was $8 bringing the cost for each to $1.30. Sell a few of the spares at an obscene profit and the ones you keep will essentially be free. Be sure and wear a breathing filter when grinding the flints. A friend tried to de-hump some flints using some diamond wheels he had and they developed so much heat the flint popped and cracked in half. There is very little heat developed with the Mizzy wheel.