Iphone earphones pop out of the jack?

The problem isn't in the jack, it's the part of the earphone which slots into it. In the pic I have an old (broken) pair and my new ones. And you can see the problem (the stripes on the metal part used to match up perfectly)
On my new ones I somehow pulled off the wire bit (accident, no idea how or why they came off) and I pushed it back on, yet worked fine for a while but all of a sudden it popped out. It'll work I I hold it in though.
Is there anyway to repair them? They still work fine if they are held in so I don't wanna throw them away. Any help?

I would suggest moving this question to computer and internet category because this is car repairs.

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