worn drum roller - squealing

Removed front panels and swiveled lid upwards. Loosened tensioner, removing belt and then carefully extracting the drum. Replaced 2 drum glides on underside of front panel. Next 2 rollers, which appear to unscrew, but do not do so. You must remove the retaining ring (surprise! ...and 2 screw drivers later). This was the longest and most frustrating part of the whole ordeal. Then just reverse the process for reassembly. This was my first electric dryer repair and it really wasn't too bad. Online docs I found were somewhat helpful, but really luck and perseverance. I did save probably $300 in replacement costs, which is quite satisfying. .