My Go was getting harder to crank and was making a noise. DH took the rollers out (very easy to do) and replaced the bearings. There are four bearing. Cost about $8. The Go turns like butter with six layers. DH was impressed with the quality of the Go, all inside parts are metal. I ordered the Go Big while he was working on the Go. I had my doubts. LOL It took him about an hour to have the Go good as new after buying the bearings.