@jonathon Haven’t bought a knife blade yet, or a plate. I learned to lap things a long time ago. We used to use lapping blocks to recondition parts in diesel fuel injectors. It is very effective, you are really just flattening out the steel and putting an edge back on the blade just like sharpening a knife. When you lap the plate you are taking the scratches and groves out. I believe it works as well as grinding and makes them last longer.