I hope no one is offended by this story, but it does involve hard rings and machinists.
A good friend of mine runs a machine shop in a seaside community. He often does work for local boat owners. One snowy winter night he received a phone call from one of his customers, a doctor in an emergency room at the local hospital. He asked how to cut a metal ring that from his description my friend determined was a ball bearing race. My friend suggested the only way to cut it would be an angle grinder with a cutoff wheel. Doctor asked him if he had one and could bring it to the ER. He did and was shown the problem- a young man had applied the ring around a sensitive part of his anatomy, swelling had occurred, and now the ring was stuck. They had been applying cold water but the swelling was persistent.
The ring was cut with the grinder and I assume the patient recovered. I have seen one half of the cut off ring.
Tin, you also know this fellow, probably the tallest guy you have met.