i'm sure last time i plulled one aff the s/c once i had undone the end nut, pulled that bit off there was a large circlip and then an internal nut that i used a pair of longnose pliers to undo. (end of pliers into the grooves in the nut). it was years ago though.
i'm sure you will find a pic or diagram on this forum or the old toymods forums.
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