You can increase the cutting power of your knives by sharpening them in the slots of the block when your knives are dull. To remove the knife from the block, insert the knife into the block and gently pull it out. Until you reach your desired sharpness, repeat this process as necessary. Ceramic grinders should only be used for honing, not for sharpening, because they degrade quickly when used for that. Therefore, instead of replacing the sharpener for the block, you should find another way to improve the sharpness.