Knap used in a sentence

Knap in a sentence as a verb

If they were using obsidian other than the issue of constantly having to knap new blades it should have been somewhat easy to work with. The only reason we don't use this in modern times is that the blades break apart over the long term.

Sort of "Everyone gets their arrowheads from zog, not only does he knap a mean flint that won't break hitting even the hardest bison, he knows everything that is going on around the campfire and has great stories."