I have worn holes in the end of plastic thimbles and even metal thimbles!! There is no point keeping them after that, you know the needle ALWAYS finds its way into that hole! Ouch!
To Seaside Gal - I used to save jars too. Then I was talking with a friend who had recently cleaned out her elderly mother's large house. She said her mom had a whole room full of jars. That made me think, when I want to keep something, I picture someone looking at it after I am gone, and shaking their head wondering, "Why on earth did she keep THAT?"
Now that I have sold my house and bounce between two furnished rental condos, my jar saving days are over!!