Well, I finally broke down and bought one .. mostly to scratch an itch.

This thing is a bear to flatten! I've been working on the back side to try to save the stamp. My DMT 325 is well worn, and not up to the task. Jamie, who knows this stone inside out, suggested 325 Wet or Dry. That has gotten me most of the way, but as we get closer and closer to the entire surface clean, the harder the going gets because so much surface area needs to be removed. I need a new DMT 325 anyway, but I'm wondering if I should also get the 220 DMT to speed things up?

Any advice from those that have been in this boat?