I'm not familiar with it, but there are only so many ways to assemble something. If you've removed everything you can find and it still won't move, I would clean out any grease and look for an internal spring clip.
It is possible that it is simply stuck. To chase that hypothesis, put a very thin blade (not a screw driver) in the crack behind the prop and tap it. I use a putty knife or cheap
chisels that I save for this job.