Hey geeks , so I did a new client today, removed old rings ( tubes) from previous install by her last tech and install my mini locks. Her old rings were a really weird shape I had a right nightmare getting them out! I haven't come across this before. They were bent in the middle? Almost folded back on them selves so sharp edges and when I flattened them out and tried to pop open the ring they kept bending again is anyone familiar with this method??