Adjustable slider won't close

Hi There,

I was looking to replace my ear cups but I figured I might also wan’t to fix an annoying issue I “fixed” with gorilla glue and make the headphones a little nicer.

I had dropped the headphones multiple times, resulting in the slider on one side being unable to close fully/lock in place. See attached photo.

My question is: is the slider part of the headband? I see that headbands can be replaced relatively easily and if that would fix my problem then I will do it.