Most friction fit earring backers will stretch, including more costly metal butterfly backers. The tension can be adjusted on your backers easier than what you may think. Silicone backers should be thrown away when stretched out.
Until recently, it never occurred to me that extending the life of friction backers could be done, and as it turns out there are many articles on the subject. Before making this discovery, I came up with a method that would work well for those of us with physical annoyances, such as eyesight or arthritis, that would otherwise make this frustrating beyond words. The tool list is short...a bobby pin or piece of bent wire and a pair of inexpensive loop closing pliers is all that is needed.
This is the over kill version. For those of you with younger hands, fingers and a bobby pin should do the trick.