In my opinion, Atom freewheels were far better made than those from Regina including most top of the line Regina Oro freewheels with gold colored sprockets.

Phil Wood made a special thin walled freewheel removing tool that slipped over the lock nuts on Campy and other better quality hubs without having to remove  the nuts and spacers. They were a must have with Phil Wood and other sealed bearing hubs. These were pretty fragile tools because of the thin walls. At our shop we went through 3-4 a month. Park tool makes a similar tool but the walls look a little thicker.

Came in four speed version as well.