Instead of using this tool to make jump rings, I use it to make loops, and then wrap. Basically, I just use it for the 90 degree angle part of the wrap. When making a set of earrings, you simply have to remember which diameter you will be using for the 90 degree angle so they will match and then do your wrap free hand.
this helps take the "human error" factor out of making a loop, and i'm all for anything that takes the guess work out! i hate marking my tools and now i don't have to.