Most cush drive dampers come out fairly easy unless they have been in there to long then they get a bit difficult to remove cos they distort. Usually the way to get them out is to take the wheel out then the drive side of the wheel is a lot of wiggling and swearing to get it apart, should just be a push fit, don't think any of the main manufacturers bolt them in, might be wrong about that but never had a problem getting them apart other than the above.