• It's quite fiddly, and sometimes you need weird tools to get in there. The little springs (they're teeny tiny) have a habit of pinging across the room into permanent oblivion.

    But you can try less drastic measures. Sometimes just taking the cassette off will let you grab any thread/hair/blah that's wrapped itself around stuff, and often a squirt of light oil into various unscientific crevices (or even degreaser) will be enough to rejuvenate semi-corroded or gacked up innards.

    Depending on the wheel, you could just pay a shop to fit a new freehub, although as Marco found out, sometimes the parts are hard to find.

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