That is correct. I haven't put them in the wrong order before but I have gotten my ring stuck in the unit before making it hard to remove. I was able to get it out by using a thin flat head screwdriver and very gently prying it loose from the chamber, being extremely careful not to accidentally damage the unit. I hope this helps. It should have come with both rings when you purchase it. If it didn't come with it included that must have been a mistake on herme's end. I'd shoot them an email.