Aha! Fellow momentum on ear user! Sorry to say but that specific little twisty thing at the end of the 2.5mm part makes it so you can only buy a very specific replacement for it. Amazon has them, just write “momentum on-ear cable” and you should fine aftermarket ones.

Oh shit, I’m so happy I’m not alone on this.Bit extreme but I’ve also never once agreed with a single IEM opinion he’s had! Guess we have different ears…