The bottom part is called a shoe. At the top of the balancer channel there are two screws. Undo them and that assembly should slide right out. The shoe is then pushed to the top and slides out of the same spot.
Is it broken in some way? It looks like the metal loop end just needs to get placed into the shoe.
You can search for parts to send a picture to swisco.com and they will tell you what you need as far as parts.