Everyone's correct. Norton's do require a lot of lapping in the beginning to remove the rough gritty surface. Sometimes, you need to remove 1/8 of the stone. Once done, it should feel smooth to the touch. Make sure you edges and corner's are chamfered as well. Sounds like the blade is hitting a spot on the edge. Once that's done, soak the stone for at least 30 mins prior to use, and run your fingers over the entire surface area of the hone, also down the edges and corner's. Make sure it feels smooth to the touch. If you find any rough spots, touch them up with your lapper of choice.