Remove the head and the o-ring.
I use a strong boot lace or piece of paracord. Make a loop and hook it under the clip. A few hard tugs will usually do it.
Make sure that you do not lose the small plastic wedge that is under the clip. You will need it to reinstall. I usually do this pulling and tugging inside or really through a plastic grocery bag. If the plastic piece flies out it will be in the bag.
Also keep in mind that with no clip, you may have an issue with the o-ring pushing out from under the head.
Mark