Thanks guys for all the input here. I have one of these that is about 6" x 2" x 1 7/16" thick. I have played with it but not given it much serious attention. It takes a bit of work to raise a slurry with the slurry stone that came with it. I have been using a diamond lap that I have on hand that is 600- grit (It started life as a new 600 grit. but with many years of use it is a bit wore out). That diamond lap does a fairly good job of raising a milky slurry.

After reading this I think I am going to play with that a little more seriously and see just what I can get out of it.

Ray