I am working on measurements for a jailbird and I am basing the ring size off of my bon4m but my concern is that sense the ring was hinged I might not be able to get that same size ring on with no hinge. Anyone have any experience with this?
You may want to order the sizing rings from MM and see how you go. Generally if you can get one testicle through, the rest will follow.
what Wendy said....lube lube lube! I just got my ring back from MM which was sized down and was a bit intimidated by how small it was. Sure enough it fit though