Some time ago I've been asked to refurbish those Tojiro's.
I took them with me to JNS gathering 2014 part 2 in Denmark. I am very happy that I've done it, because they were very thick and thinning them manually on the stones could be PITA. Instead I have used Japanese water wheels. After that I finished thinning on the stones and polished them by hand. My next step was to etch them in Ferric Chloride. Here you have end results. I really regret that I didn't took pictures of the grind before I started my work