Skinny glass plates + Sandpaper/lapping film
I tried to hone what must be warped blades on my Norton stones with little success.
I went to a local glass shop and had them cut me some skinny sheets of glass to use with lapping film/wet-dry sand paper to use with the warped blades to see if this will work any better than the 3 inch wide norton stones.
I had them cut from 1/4'' glass 9''x 1'', 9''x1.5'' and 9''x2'' to do some experimentation to see which will work the best.
After being frustrated with not being able to hone the entire edge of a blade due to the 3'' wide stone and blade geometry/unevenness, I'm now seeing why some folks really like narrow hones.