I saw this on You Tube and decided to try it out.
The first wheel is a piece of mdf with white polishing compound applied to it
This is the wheel used to sharpen the blade.
The second is 5 pieces of leather glued together to hone the blade.
Turn the grinder around so the wheels spin away from you.
Since the grinding surface is mdf and polishing compound, you don't have to worry about grinding too much off.