[msdz]

Yep, replace it completely. This happened to mine as well and I just put a new one back on in it's place. A buddy of mine was working on his and his came apart on him as well, he didn't have the money to replace his at the time his came apart so he added a bunch of grease on the ball bearings. So far he has had no problems. I say if you would have added extra grease it may not have had the whine.