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just gently wiggling it back and forth i have a feeling the spring is caught somewhere, it should be two pieces withe the spring inbetween, try boiling hot water and pouring it on it then try seperating
Heat might not be the best idea because im pretty sure springs are heat treated and that might ruin the spring and i dont think theres many spares out there.
Be carful when you take them apart and maybe take it part with it in a clear bag maybe.