This certainly answers my question. Thanks everyone. Normally, I would try the .5 diamond on hard felt first, but it seems to be a little bit harsh sometimes, so I figured I would hit the stones and see.

Another question: I have .5 diamond on felt, and Chromium oxide on felt as well. I haven't used the chromium yet, but wonder if anyone has found a noticeable difference between the two. Of course I could just try and see for myself, but I figured I would get a little input.