Been fooling around with these two:
Name: Aiiwatani.jpg Views: 342 Size: 25.4 KB

The one on the left is the Oozuku mizu asagi I have posted about before. The one the right is an Aiiwatani that Maksim recommended to me for a tomonagura. It produces a nice slurry with little effort. It works very fast, lots of swarf after 50 roundtrips on the Oozuku. The edge produced after those 50 roundtrips is really keen. No further improvement after 50 roundtrips on the Oozuku without a slurry.