I emailed Stuart Tierney at Tools from Japan, a person I have dealt with many times re purchases, who said, 'If you are putting this near any of my stones (Gokumyo Suehiro's) you will void the warranty of both the lapping plate and your 20 K Suehiro'.....bang. I was told in no uncertain terms, 'Don't use it.
[....]Quote (from Stuart Tierney
store@toolsfromjapan.com)
""I have the pictures and high value $$$bills to say it's a bad idea!"
[...]
"The Atoma #1200 is a good bit of kit, but with the diamonds relatively small, the nickel plating has a hard time holding onto them and they can dislodge from the plate contaminating the stone, wearing out the Atoma very quickly and causing more problems than anyone wants or needs. This plate is better suited to steel, (Hard steel)."
[...]
"The Atoma #400 is better suited, Just run it over a few coarse stones to take off the high spots, then you'll be all set with it. It'll flatten the fine stones well leaving a smooth finish."