You can buy diamond points at machine shop supply places. In my case it was a 3/8 inch peice of cold roll with a bit of industrial diamond attached to the point. I turned it down and inserted into a bored hole in the threaded rod, that passes through the aluminum block. You drag it across the face of the stone to dress it. The threaded adjuster allows you to advance the diamond a little bit at a time. Each pass across the stone only removes a couple of .001. The angle rides on the grinders tool rest, keeps the cut parallel to the wheel face and prevents the diamond from digging in. It does a really fine job.
Excellent. I never knew where the idea came from. My friend saw one somewhere and copied it. I saw his and came up with my own version. Mine is more like the Geiger. Great tips in VID on how to use it. That part I never new, Thanks Glen.