I have a coper john dead nut hunter sight. Which I really like it is a great sight.

My question is I want to Go to a peep that will allow me to sight in on the rim ( out side circle orange ring) of the sight instead of the pins. What type peep and what size hole would I need in it. I now have a 3/16 peep that fits in the string on three sides but I can' t see the circle on the rim of the sight. I have my sight all the way forward. Thanks for any help you can give me!