It can be a pretty big pain in the butt.. However if you're interested you can read Scurvy's thread. He had a nice DIY plus if you read through the discussion you can find out ahead of time how people have gotten hung up in various ways. (Myself included!) I'm on my phone now so I can't copy the link, but if you search it will appear.cool, I might just replace the bearings. How hard is it to do?