In reply to gethin_allen:
> Chris King do a similar product but they are probably about £400 or something ridiculous as most Chris King things are.
Indeed, but you do only buy once. And that Chris King vzzzzzzzzzz from the rear hub is a wonderful noise, especially when the person you are drafting is busting a gut.
If you have the correct tools you should be able to press the bearing out numerous times. If you bodge it, then you're less likely to be able to do that - straight in and straight out. Has the bearing failed or is it just creaking? My BB30 bike was creaking (second ever BB) and then it shut up again.