NRS rings can work against up shipping Carlisle oars
I have the NRS tethers too and have liked them though I'm somewhat new to rafting. I went down royal gorge a couple weeks ago and friend/gorge guide rowed Sunshine in my boat. She has a habit of quickly shipping oars by pulling them center inboard on some of the tighter moves. I usually ship forward on Browns but she likes keeping them in the water a second longer and pulling. An oar in to avoid a rock.
She was not used to my tethers and had a little trouble because the ring slid down to the Carlisle blades as the oar can in and then hung up on the lip where the blade meets the shaft (wooden oars and maybe others don't have that lip). So right when she needed that blade back in the water quickly, the ring caught on that lip preventing use of the oar. It was a quick disconcerting moment and nothing terrible happened. To make matters worse while trying rectify this mid Sunshine the tether strap went up over the oar lock, so it went from the frame, wrapped around the lock then down to the ring. That didn't really prevent the oar from working but she was fed up dealing with those tethers after that. She usually uses a bowline tied cord without rings and has not had that happen before.