The two large rings do not snap together for a few millimeters. They have something like a nail that protrudes on the back side. I struggled with it for three hours and they wouldn’t snap together in any way. I had to remove this protrusion with some special grinding tool I had. Like the ones women use for their nails. Then double-sided tape for security. Of course, I wouldn’t have gone through this process, but I had already unsnapped the whole dial and was fully committed. If I had known this from the beginning, I wouldn’t have bought them. I hope they don’t come off..