I have a bottle of oil I want to open. It is a glass bottle with a threaded metal cap. It is the type of cap which is connected in a few places to a lower ring. Usually, one just unscrews the cap, and it tears off the ring, which stays below the threads.
I now have a bottle whose cap+ring system is too loose. When I turn the cap, the whole thing, cap+ring, rotates freely without unscrewing or exerting a tearing force on the connection places.
What I tried, unsuccessfully:
- turn it vigorously
- grip it with a towel while turning
- exert an upward pull while turning it
- holding the lower ring with the fingers of one hand while gripping the cap with the fingers of the other hand through a towel, and exerting force in opposite directions
- trying to cut the connection places with a knife tip (doesn't get cut, but it feels like the knife might slip and hurt me any time).
Note that this is a different problem than the much more common one of both not turning and my fingers slipping on the cap instead. I can grip the cap perfectly well, and it rotates very easily, it just doesn't unscrew or separate from the ring.