I have had it with RN Safe Stops. The original that came with the seat had to be cut off because it would not come off. I emailed Diono a video and they sent a new one. I couldn't get that one on at all. I spent an hour doing everything I could think of. So I sent another video. They sent another one. Same issue. The hole is simply too small to hook on to the splitter plate that holds the straps. I've got to use this seat for a 37lb child. Does anyone else have this problem?