Has anybody had trouble with this freewheel? I'm really disatisfied with the product, I've already had the freewheel replaced twice by rock n roll bikes in short periods. And its the same problem everytime, the pawls just keep snapping, and its happend again tonight after four days use. Ive been bedding them in with gt85 1st before any trials use as well and the freewheel always feels and sounds great, next minute bang it'll start crunching or even lock up. I've try'd getting a refund but they just insist on sending me a new one, if they do send me another one it'll be the fourth one I've had but I wouldn't want to use it after all the previous inconveinience I've had. God knows what to do??