Thread: the best synthetic finnishing stone

If you flatten your Spyderco hone, you RUIN your Spydero hone. The hone is guaranteed to be flat. If you find that it is not, then exchange it for one that is. Never lap a Spyderco hone.

If by flat, you mean smooth, then that is another issue and it cannot be corrected by lapping. The Spyderco hone achieves its cutting capacity by those swirl marks that the factory has lapped into the hones. This is why the Spyderco F and UF are made of exactly the same material. Their only difference is created by the factory lapping.