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.
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.