I've been shopping around and reading reviews on flattening stones. The most common one being the Norton flattening stone of which has a ton of negative reviews of it being crooked out of the box and worthless on anything above 1000 (even though it is most often recommended for the 4000/8000 combo stone.) I've noticed that Naniwa makes one that looks very similar to the Norton but have never been able to find any reviews. Any recommendations? If it's possible, I'd like one lapping plate that would work well on 1k-12k......that isn't going to cost me one of my kidneys. nah mean?