First off I am a beginner and by no means do I know what I am doing as of yet. Now for the question. I purchased a norton 4k/8k and DMT 325. I lapped the 8k and a Naniwa 12k with no issues. Now the 4k has lapped uneven by 1/8" on the width of the stone - 3in. First question can this be corrected with lapping the high side or would it be better to buy a new one. Next what would cause this because I used the figure 8 method? Thank you