I’ll figure out the legalese of what I want my warranty to be someday, but for now, I’ll write it in plain old English.

I will fix any of my knives for as long as I am physically able to. If there is a defect in the material, or the workmanship, I will fix it free of charge. Plain, and simple. I will make it right.

Now, if you abuse it, or mess it up, I’ll still try and fix it. Of course we’ll have to work out some compensation for you abusing one of my fine knives, but you’ll find I’m reasonable.
Sound Fair?