They are just press fitted in so if you are not gonna re use just use channel locks twist out toss in the can.
Mick, do you run oem or aftermarket bar ends? Are there any decent quality afmkt?
I had a set of Lightech, but they install with that expanding rubber grommet and are never actually secure.
Here are the custom bar ends I had ran off couple sets few years ago. Stainless with brass inserts.