KINK3D products can sometimes fit together snugly. If your device has a tight fit, it may be difficult to pull the cage straight forward off the base ring. Instead, pull the cage off the base ring at a slight angle, alternately pulling one pin at a time (left pin, right pin, left pin, right pin...).
You should be able to "wiggle" the cage off the base ring using this method. It can be much easier than pulling straight out away from the base ring.