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i think you'll be set with the coticule and pastes

the norton prep stones speeds the cutting action fo the norton which isn't all that necesary as it's already a pretty fast stone. Not sure it it gives a better finish or not

the idea of using a diamond stone is that the coticule won't abrade the diamond stone so you end up with pure coticule slurry which is what you'll have if you use the cotigura (since you're rubbing...

the 2" will be wide enough for the tosuke and a great width for razors (just bought one myself) the cotigura is is a small piece of coticule whereas the nagura is a piece of chalk stone. i too...

it's definately finer and will give you a sharper edge, but i'd hazard a guess and say the coticule gives a smoother edge. the shapton pro stones are also harder and less forgiving if your technique...