STUCK TOP FORK CAP GEN 1 III

[Steff]

Here's one for you great minds. So I'm replacing the fork seals on my ped, easy init? If it involves me there is always an issue. Right, the bloody cap won't come off. It unscrews fully but seems to be firmly stuck on the piston thingy. I've tried gently drifting it up and off; no luck. Has anyone had this and solved it? I really don't want to take it to a workshop for this. Ah, just noticed on the parts diagram that there is a circlip up there. What does that hold?