So I'm at approx. 15mm currently and don't intend to size up any time soon. I have however been toying with the idea of hooking a captive bead ring through my tunnel to enhance the look a little bit. Problem is, I don't know what size ring is gonna fit. The diameter is the main issue here. I've looked at a couple of CBRs and they don't look like they would fit through a 15mm tunnel. Any advice on what kind of jewelry to get?