And you simply fixate the new sleeve pushing it back in. NOTE that there is this "thingy" at the bottom of the male part of the connector (picture above!), i.e. there is only one correct rotary position, in which you need to insert the sleeve. Push it in sufficiently (by hand), and then push the white "grip" back up again - carefully - I gave it a few soft hits with that part of my hand, which is between wrist and palm.