Hmmmm....Mill out the center to make space for custom engraving etc...
#1 So, pretty much like your existing spinners, but with a lowered center instead of a raised one. Keep the "lip" the same width as it is now before the "cone" starts. Have the center section be the same diameter of the raised portion. Know what I mean?
#2 Keep the center perfectly flat, but add a groove all the way around at the same point where the "cone" starts now. That would still leave space for something custom in the middle.
I need to buy one of these eventually..
